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1. Determination of vitamins A and E in cooked sausages

Author:
Sancho Ortiz, Maria Teresa,   et al.   ; Valls, Felicidad; Fernández-Muiño, Miguel A.; Checa, Martín A.;     Show all 4 Authors
Source:
European food research & technology 2007 v.226 no.1-2 pp. 181-185
ISSN:
1438-2377
Subject:
acetonitrile; detection limit; fluorescence; food research; hexane; oxidation; pyrogallol; reversed-phase high performance liquid chromatography; saponification; sausages; tetrahydrofuran; vitamin A
Abstract:
... A reliable and sensitive reverse-phase HPLC method is described for the separation and quantification of all-trans-retinol and dl-α-tocopherol in cooked sausages. Samples were chromatographed with UV and fluorescence detection on a 15 cm x 0.4 cm i.d. Spherisorb ODS-2, 5 μm column, using as mobile phase a mixture of 90% acetonitrile and 10% tetrahydrofuran. Sample preparation included saponificati ...
DOI:
10.1007/s00217-006-0524-5

2. Sensitive and selective determination of glutathione in probiotic bacteria by capillary electrophoresis-laser induced fluorescence

Author:
Raggi, Maria Augusta,   et al.   ; Musenga, Alessandro; Mandrioli, Roberto; Bonifazi, Paolo; Kenndler, Ernst; Pompei, Anna;     Show all 6 Authors
Source:
Analytical and bioanalytical chemistry 2007 v.387 no.3 pp. 917-924
ISSN:
1618-2642
Subject:
Bifidobacterium; Lactococcus; acetonitrile; capillary electrophoresis; carcinogenesis; colon; derivatization; electrolytes; fluorescence; fluorescent dyes; glutathione; oxidative stress; pH; probiotics; temperature; thiols
Abstract:
... Glutathione (GSH) is a thiol with an important function in protecting tissue against the oxidative stress which has been related to carcinogenesis in the colon. For this reason the development of probiotic species producing glutathione could be of great interest. To determine the glutathione content of some probiotic bacteria of the Bifidobacterium and Lactococcus genera, a very sensitive and sele ...
DOI:
10.1007/s00216-006-0980-6
PubMed:
17203251

3. Simultaneous analysis of classical neuroleptics, atypical antipsychotics and their metabolites in human plasma

Author:
Grillo, Maria; Raggi, Maria Augusta,   et al.   ; Mercolini, Laura; Bartoletti, Claudio; Boncompagni, Giancarlo;     Show all 5 Authors
Source:
Analytical and bioanalytical chemistry 2007 v.388 no.1 pp. 235-243
ISSN:
1618-2642
Subject:
acetonitrile; antipsychotics; central nervous system; chlorpromazine; detection limit; haloperidol; high performance liquid chromatography; humans; metabolites; monitoring; pH; patients; phosphates; solid phase extraction; triethylamine
Abstract:
... A high-performance liquid chromatographic method has been developed for the simultaneous determination of classical neuroleptics (chlorpromazine, haloperidol, loxapine and clotiapine), atypical antipsychotics (clozapine, quetiapine and risperidone) and their active metabolites (N-desmethylclozapine, clozapine N-oxide and 9-hydroxyrisperidone) in human plasma. Separation was obtained by using a C8 ...
DOI:
10.1007/s00216-007-1195-1

4. Acetylcholinesterase-based biosensors for quantification of carbofuran, carbaryl, methylparaoxon, and dichlorvos in 5% acetonitrile

Author:
Ramírez-Silva, Maria Teresa,   et al.   ; Valdés-Ramírez, Gabriela; Cortina, Montserrat; Marty, Jean-Louis;     Show all 4 Authors
Source:
Analytical and bioanalytical chemistry 2008 v.392 no.4 pp. 699-707
ISSN:
1618-2642
Subject:
Drosophila melanogaster; Electrophorus electricus; acetonitrile; acetylcholinesterase; apples; biosensors; carbaryl; carbofuran; cobalt; detection limit; dichlorvos; electrodes; genetic engineering; immobilized enzymes; phosphates; polymers; storage quality
Abstract:
... Amperometric acetylcholinesterase biosensors have been developed for quantification of the pesticides carbofuran, carbaryl, methylparaoxon, and dichlorvos in phosphate buffer containing 5% acetonitrile. Three different biosensors were built using three different acetylcholinesterase (AChE) enzymes--AChE from electric eel, and genetically engineered (B394) and wild-type (B1) AChE from Drosophila me ...
DOI:
10.1007/s00216-008-2290-7
PubMed:
18663432

5. Fast sample preparation and liquid chromatography-tandem mass spectrometry method for assaying cell lysate acetylcholine

Author:
Hein, Eva-Maria,   et al.   ; Schebb, Nils Helge; Fischer, Daniel; Hayen, Heiko; Krieglstein, Josef; Klumpp, Susanne; Karst, Uwe;     Show all 7 Authors
Source:
Journal of chromatography 2008 v.1183 no.1-2 pp. 100-107
ISSN:
0021-9673
Subject:
acetonitrile; acetylcholine; cultured cells; detection limit; hydrophilic interaction chromatography; tandem mass spectrometry
Abstract:
... A fast liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for the analysis of acetylcholine (ACh) in cultured cells. [²H₄]Acetylcholine (ACh-d ₄) was used as an internal standard for calibration. ACh was extracted from the cell lysate with acetonitrile (ACN)/water (80/20, v/v) and the crude extract was analyzed without further purification. Isocratic hydrophilic interac ...
DOI:
10.1016/j.chroma.2008.01.033

6. Determination of fluoxetine and norfluoxetine enantiomers in human plasma by polypyrrole-coated capillary in-tube solid-phase microextraction coupled with liquid chromatography-fluorescence detection

Author:
Queiroz, Maria Eugênia Costa,   et al.   ; Silva, Bruno José Gonçalves; Lanças, Fernando Mauro;     Show all 3 Authors
Source:
Journal of chromatography 2009 v.1216 no.49 pp. 8590-8597
ISSN:
0021-9673
Subject:
absorbance; acetonitrile; antidepressants; blood proteins; chromatography; correlation; elderly; enantiomers; fluorescence; humans; pH; patients; potassium; sodium phosphate; solid phase microextraction; therapeutics
Abstract:
... A sensitive, selective, and reproducible in-tube polypyrrole-coated capillary (PPY) solid-phase microextraction and liquid chromatographic method for fluoxetine and norfluoxetine enantiomers analysis in plasma samples has been developed, validated, and further applied to the analysis of plasma samples from elderly patients undergoing therapy with antidepressants. Important factors in the optimizat ...
DOI:
10.1016/j.chroma.2009.10.034

7. Enantioselective determination of thyroxine enantiomers by ligand-exchange CE with UV absorbance and ICP-MS detection

Author:
Montes-Bayón, Maria,   et al.   ; Kang, Jianzhen; Kutscher, Daniel; Blanco-González, Elisa; Sanz-Medel, Alfredo;     Show all 5 Authors
Source:
Electrophoresis 2009 v.30 no.10 pp. 1774-1782
ISSN:
0173-0835
Subject:
absorbance; acetonitrile; copper; detection limit; drug formulations; electrophoresis; enantiomers; iodine; pH; temperature; thyroxine
Abstract:
... A simple CE method has been developed for the separation and determination of thyroxine (T₄) enantiomers in pharmaceutical formulations. The method was based on ligand-exchange mechanism using a Cu(II)/L-proline complex as chiral selector. The effects of different parameters affecting separation such as chiral selector concentration, organic additive, buffer pH and temperature were investigated. A ...
DOI:
10.1002/elps.200800731

8. Fast separation of selective serotonin reuptake inhibitors antidepressants in plasma sample by nonaqueous capillary electrophoresis

Author:
Queiroz, Maria Eugênia Costa,   et al.   ; Catai, Ana Paula Formenton; Carrilho, Emanuel; Lanças, Fernando Mauro;     Show all 4 Authors
Source:
Journal of chromatography 2009 v.1216 no.30 pp. 5779-5782
ISSN:
0021-9673
Subject:
acetonitrile; antidepressants; capillary electrophoresis; chromatography; electrolytes; humans; ionic strength; liquid-liquid extraction; monitoring; pH; phosphoric acid; serotonin
Abstract:
... A simple, fast, and sensitive liquid-liquid extraction method followed by nonaqueous capillary electrophoresis (LLE/NACE) was developed and validated for simultaneous determination of four antidepressants (fluoxetine, sertraline, citalopram and paroxetine) in human plasma. Several experimental separation conditions using aqueous and nonaqueous media separation were tested by varying the electrolyt ...
DOI:
10.1016/j.chroma.2009.05.050

9. Focused Microwave-Assisted Extraction and LC Determination of Ketoprofen in the Presence of Preservatives in a Pharmaceutical Cream Formulation

Author:
Gaudiano, Maria Cristina,   et al.   ; Labbozzetta, Stefano; Valvo, Luisa; Bertocchi, Paola; Alimonti, Stefano; Manna, Livia;     Show all 6 Authors
Source:
Chromatographia 2009 v.69 no.3-4 pp. 365-368
ISSN:
0009-5893
Subject:
acetone; acetonitrile; cream; drug formulations; ketoprofen; liquid chromatography; lysine; microwave treatment; pH; particle size; phosphoric acid; potassium; potassium dihydrogen phosphate; preservatives; screening; solvents; temperature
Abstract:
... A simple and rapid open-vessel focused microwave-assisted extraction (FMAE) method followed by LC analysis was developed for the determination of ketoprofen lysine salt in the presence of methyl p-hydroxybenzoate and propyl p-hydroxybenzoate preservatives in topical cream. Extraction were performed in acetone/potassium dihydrogenphosphate (25 mM, pH 3.0) (70:30 v/v) by reaching a target temperatur ...
DOI:
10.1365/s10337-008-0892-z

10. LC Evaluation of Intestinal Transport of Praziquantel

Author:
Gremião, Maria Palmira D.,   et al.   ; Cinto, Priscila O.; Souza, Ana Luiza Ribeiro; Lima, Andréa C.; Chaud, Marco V.;     Show all 5 Authors
Source:
Chromatographia 2009 v.69 no.2 pp. 213-217
ISSN:
0009-5893
Subject:
absorbance; absorption; acetonitrile; chromatography; detection limit; drugs; gastrointestinal system; models; monitoring; praziquantel; rats; solubility
Abstract:
... Praziquantel (PZQ) is a highly lipophilic drug with low aqueous solubility. Despite this, it is well absorbed from the gastrointestinal tract. In this study, a simple LC method was developed and validated, in order to monitor the concentration of PZQ in TC-199 buffer in vitro, in the rat everted gut sac absorption model. PZQ was analyzed by a reversed-phase LC method with an isocratic mobile phase ...
DOI:
10.1365/s10337-009-1019-x

11. Analysis of cocaine and two metabolites in dried blood spots by liquid chromatography with fluorescence detection: A novel test for cocaine and alcohol intake

Author:
Raggi, Maria Augusta,   et al.   ; Mercolini, Laura; Mandrioli, Roberto; Gerra, Gilberto;     Show all 4 Authors
Source:
Journal of chromatography 2010 v.1217 no.46 pp. 7242-7248
ISSN:
0021-9673
Subject:
acetonitrile; alcohol drinking; blood; cocaine; ethanol; fluorescence; high performance liquid chromatography; metabolites; monitoring; pH; pretreatment; psychotropic agents; solid phase extraction; solvents
Abstract:
... An original HPLC method coupled to spectrofluorimetric detection is presented for the simultaneous analysis in dried blood spots (DBS) of cocaine and two important metabolites, namely benzoylecgonine (its main metabolite) and cocaethylene (the active metabolite formed in the presence of ethanol). The chromatographic analysis was carried out on a C8 column, using a mobile phase containing phosphate ...
DOI:
10.1016/j.chroma.2010.09.037

12. Fast liquid chromatography/tandem mass spectrometry (highly selective selected reaction monitoring) for the determination of toltrazuril and its metabolites in food

Author:
Maria Teresa Galceran,   et al.   ; Anna Martínez-Villalba; Encarnación Moyano; Claudia P. B. Martins;     Show all 4 Authors
Source:
Analytical and bioanalytical chemistry 2010 v.397 no.7 pp. 2893-2901
ISSN:
1618-2642
Subject:
acetonitrile; atmospheric pressure; detection limit; drugs; ionization; liquid chromatography; meat; metabolites; monitoring; tandem mass spectrometry; toltrazuril
Abstract:
... In this work a fast liquid chromatography (LC)–tandem mass spectrometry (MS/MS) method was developed for the analysis of toltrazuril, a coccidiostatic drug, and its metabolites in meat food products. The applicability of atmospheric pressure chemical ionization (APCI) and heated electrospray ionization in both positive and negative modes was studied. APCI in negative mode provided the best results ...
DOI:
10.1007/s00216-010-3704-x
PubMed:
20658773

13. Influence of salt ions on binding to molecularly imprinted polymers

Author:
Kempe, Maria,   et al.   ; Kempe, Henrik;     Show all 2 Author
Source:
Analytical and bioanalytical chemistry 2010 v.396 no.4 pp. 1599-1606
ISSN:
1618-2642
Subject:
acetonitrile; aqueous solutions; benzylpenicillin; ion exchange; ions; milk; models; molecular imprinting; polymers; propranolol; salts; solid phase extraction; water activity
Abstract:
... Salt ions were found to have an influence on template binding to two model molecularly imprinted polymers (MIPs), targeted to penicillin G and propranolol, respectively, in water-acetonitrile mixtures. Water was detrimental to rebinding of penicillin G whereas propranolol bound in the entire water-acetonitrile range tested. In 100% aqueous solution, 3-M salt solutions augmented the binding of both ...
DOI:
10.1007/s00216-009-3329-0
PubMed:
20012741

14. Simultaneous determination of disulfiram and bupropion in human plasma of alcohol and nicotine abusers

Author:
Saracino, Maria Addolorata; Pieri, Maria Chiara; Raggi, Maria Augusta,   et al.   ; Marcheselli, Chiara; Somaini, Lorenzo; Gerra, Gilberto; De Stefano, Francesco;     Show all 7 Authors
Source:
Analytical and bioanalytical chemistry 2010 v.398 no.5 pp. 2155-2161
ISSN:
1618-2642
Subject:
acetonitrile; alcohols; detection limit; disulfiram; humans; nicotine; phosphates; solid phase extraction; triethylamine; wavelengths
Abstract:
... An isocratic high-performance liquid-chromatographic method has been developed for the simultaneous determination of disulfiram and bupropion in human plasma samples. Analyses were carried out on a C₈ reversed-phase column using a mobile phase composed of 50% acetonitrile and 50% aqueous phosphate buffer, containing triethylamine. Diode-array detection was used, operating at a wavelength of 250 nm ...
DOI:
10.1007/s00216-010-4172-z

15. Analysis of risperidone and 9-hydroxyrisperidone in human plasma, urine and saliva by MEPS-LC-UV

Author:
Maria Augusta Raggi,   et al.   ; Roberto Mandrioli; Laura Mercolini; Domenico Lateana; Giancarlo Boncompagni;     Show all 5 Authors
Source:
Journal of chromatography 2011 v.879 no.2 pp. 167-173
ISSN:
1570-0232
Subject:
acetonitrile; blood plasma; high performance liquid chromatography; humans; metabolites; microextraction; monitoring; pH; patients; pretreatment; saliva; therapeutics; tranquilizers; triethylamine; urine
Abstract:
... Risperidone is currently one of the most frequently prescribed atypical antipsychotic drugs; its main active metabolite 9-hydroxyrisperidone contributes significantly to the therapeutic effects observed. An original analytical method is presented for the simultaneous analysis of risperidone and the metabolite in plasma, urine and saliva by high-performance liquid chromatography coupled to an origi ...
DOI:
10.1016/j.jchromb.2010.11.033
PubMed:
21183412

16. Blood matrix effects for male and female Wistar rats, in simultaneous HPLC-UV determination of riparin I and III from Aniba riparia (Nees) Mez. (Lauraceae)

Author:
Adriana Maria Fernandes de Oliveira; José Maria Barbosa-Filho,   et al.   ; Sócrates Golzio dos Santos; Karine Formiga Queiroga; Josean Fechine Tavares; Stanley Juan Chavez Gutierrez; Margareth de Fátima Formiga Melo Diniz; Marcelo Sobral da Silva;     Show all 8 Authors
Source:
Talanta 2011 v.86 no. pp. 233-240
ISSN:
0039-9140
Subject:
Aniba; acetonitrile; alkaloids; amides; blood; centrifugation; females; high performance liquid chromatography; liquid-liquid extraction; males; mice; muscles; oral administration; rats; sedatives; solvents
Abstract:
... Aniba riparia (Nees) Mez. (Lauraceae) is popularly known as “louro”, and is found in Amazonia and in the Guianas, its distribution extends to the Andes. Alkamide alkaloids were isolated from its green fruit; they were denominated riparin I (methyl ether of N-benzoyl tyramine), riparin II (methyl ether of N-2-hydroxy-benzoyl tyramine) and riparin III (methyl ether of N-2,6-dihydroxy-benzoyl tyramin ...
DOI:
10.1016/j.talanta.2011.09.008

17. Determination of Vecuronium Bromide in Pharmaceuticals: Development, Validation and Comparative Study of HPLC and CZE Analytical Methods

Author:
Santoro, Maria Inês Rocha Miritello; Kedor-Hackmann, Érika Rosa Maria,   et al.   ; García, Pedro López; Gomes, Fabio Pereira; Quero, Jose Luis Vilchez; Montón, Alberto Navalón; Montoya, Guillermo Crovetto; Cabrera, Mercedes Aguilera;     Show all 8 Authors
Source:
Chromatographia 2011 v.73 no.7-8 pp. 799-805
ISSN:
0009-5893
Subject:
acetonitrile; anesthesia; drugs; electrolytes; high performance liquid chromatography; pH; quantitative analysis; quinine; skeletal muscle; sodium phosphate; sulfates
Abstract:
... Vecuronium bromide is a neuromuscular blocking agent used for anesthesia to induce skeletal muscle relaxation. HPLC and CZE analytical methods were developed and validated for the quantitative determination of vecuronium bromide. The HPLC method was achieved on an amino column (Luna 150 × 4.6 mm, 5 μm) using UV detection at 205 nm. The mobile phase was composed of acetonitrile:water containing 25. ...
DOI:
10.1007/s10337-011-1945-2

18. Determination of parabens in shampoo using high performance liquid chromatography with amperometric detection on a boron-doped diamond electrode

Author:
Letícia Maria da Silva Cruz,   et al.   ; Isarita Martins; Franciely Cristiani Carreira; Larissa S. Canaes; Francisco Alberto de Souza Campos Junior; Susanne Rath;     Show all 6 Authors
Source:
Talanta 2011 v.85 no.1 pp. 1-7
ISSN:
0039-9140
Subject:
acetonitrile; cosmetics; dermatitis; drugs; electrochemistry; electrodes; estrogenic properties; foods; high performance liquid chromatography; hypersensitivity; methylparaben; pH; platinum; preservatives; quality control; solid phase extraction; stainless steel
Abstract:
... Methylparaben (MePa), ethylparaben (EtPa) and propylparaben (PrPa) have been widely used, among others, as chemical preservatives in cosmetics, drugs and foods. As these compounds are linked with allergies, dermatitis and estrogenic properties, it is necessary to control the concentration of these substances in different matrices. The aim of this paper are: to evaluate the electrochemical behavior ...
DOI:
10.1016/j.talanta.2011.04.047

19. Development and validation of a fast RP-HPLC method to determine the analogue of the thyroid hormone, 3,5,3′-triiodothyroacetic acid (TRIAC), in polymeric nanoparticles

Author:
Maria Fátima G. F. da Silva,   et al.   ; Karen C. dos Santos; João B. Fernandes; Paulo C. Vieira; Igor Polikarpov; Valtencir Zucolotto; Moacir R. Forim;     Show all 7 Authors
Source:
Analytical methods 2011 v.3 no.9 pp. 1936-1942
ISSN:
1759-9679
Subject:
acetonitrile; lactones; nanoparticles; pH; polyhydroxybutyrate; polymethylmethacrylate; reversed-phase high performance liquid chromatography; temperature; thyroid hormones; triethylamine; wavelengths
Abstract:
... The objective of this work was to develop and validate a rapid Reversed-Phase High-Performance Liquid Chromatography method for the quantification of 3,5,3′-triiodothyroacetic acid (TRIAC) in nanoparticles delivery system prepared in different polymeric matrices. Special attention was given to developing a reliable reproductive technique for the pretreatment of the samples. Chromatographic runs we ...
DOI:
10.1039/c1ay05169e

20. Improved method for plasma ADMA, SDMA, and arginine quantification by field-amplified sample injection capillary electrophoresis UV detection

Author:
Usai, Maria Franca,   et al.   ; Zinellu, Angelo; Sotgia, Salvatore; Pintus, Gianfranco; Deiana, Luca; Carru, Ciriaco;     Show all 6 Authors
Source:
Analytical and bioanalytical chemistry 2011 v.399 no.5 pp. 1815-1821
ISSN:
1618-2642
Subject:
acetonitrile; ammonia; arginine; capillary electrophoresis; derivatization; detection limit; pH; phosphates; solid phase extraction; statistical analysis
Abstract:
... Here, we describe an easy field-amplified sample injection capillary electrophoresis method with UV detection for the separation and detection of free plasma arginine and dimethylated arginines. The analytes were baseline-separated within 22 min by using 50 mmol/L Tris phosphate pH 2.3 as running buffer. The plasma samples were treated with acetonitrile/ammonia for protein elimination, the superna ...
DOI:
10.1007/s00216-010-4580-0

21. Rapid assays of clozapine and its metabolites in dried blood spots by liquid chromatography and microextraction by packed sorbent procedure

Author:
Maria Addolorata Saracino; Maria Augusta Raggi,   et al.   ; Giuseppe Lazzara; Benedetta Prugnoli;     Show all 4 Authors
Source:
Journal of chromatography 2011 v.1218 no.16 pp. 2153-2159
ISSN:
0021-9673
Subject:
acetonitrile; blood; drugs; guard cells; liquid chromatography; metabolites; methanol; microextraction; monitoring; patients
Abstract:
... A novel analytical approach has been developed for the determination of clozapine and its metabolites in dried blood spots on filter paper, using a chromatographic method coupled with a microextraction by packed sorbent procedure. The analytes were separated on a RP-C18 column using a mobile phase composed of 20% methanol, 16% acetonitrile and 64% aqueous phosphate buffer. Coulometric detection wa ...
DOI:
10.1016/j.chroma.2011.01.071

22. Regioselective acylation of d-ribono-1,4-lactone catalyzed by lipases

Author:
Maria da Graça Nascimento,   et al.   ; Damianni Sebrão; Marcus M. Sá;     Show all 3 Authors
Source:
Process biochemistry 2011 v.46 no.2 pp. 551-556
ISSN:
1359-5113
Subject:
Burkholderia cepacia; Pseudomonas fluorescens; Pseudozyma antarctica; Thermomyces; acetates; acetonitrile; acids; acylation; biocatalysts; carboxylic ester hydrolases; catalytic activity; fungi; solvents
Abstract:
... Lipases from ten different sources and two mycelium-bound lipases isolated from Amazonian fungi were screened as biocatalysts in the acylation reaction of d-ribono-1,4-lactone with a variety of acyl donors in non-aqueous media. Several reaction parameters were evaluated including the type and amount of enzyme, acyl donor, and organic solvent, as well as the influence of water and the recyclability ...
DOI:
10.1016/j.procbio.2010.10.007

23. Study of solvation processes on cholesterol bonded phases

Author:
Maria Matyska,   et al.   ; Boguslaw Buszewski; Szymon Bocian; Joseph Pesek;     Show all 4 Authors
Source:
Journal of chromatography 2011 v.1218 no.3 pp. 441-448
ISSN:
0021-9673
Subject:
acetonitrile; adsorption; cholesterol; high performance liquid chromatography; hydrogen bonding; methanol; silica gel; solvents
Abstract:
... Four cholesterol bonded phases with different structures were investigated. The columns studied were packed with stationary phase containing cholesterol attached to the silica surface using different types of linkage molecules. The presence of the polar amino and carboxyl groups in the structure of the bonded ligand strongly influence on the solvation process. The possibility of hydrogen bonding, ...
DOI:
10.1016/j.chroma.2010.11.052

24. Zinc chloride homogeneous catalysis in the tritylation of hydroxyl- and amide-bearing molecules

Author:
Maria Cecilia Vergari; Maria Pia Donzello,   et al.   ; Maurizio Maltese;     Show all 3 Author
Source:
Tetrahedron letters 2011 v.52 no.4 pp. 483-487
ISSN:
0040-4039
Subject:
acetates; acetonitrile; alcohols; amides; asparagine; catalytic activity; chemical structure; ethers; oxidation; solubility; zinc
Abstract:
... A tritylation protocol based on the transfer of the triphenylmethylcarbenium ion from trityl acetate to substrates having hydroxyls, in the presence of catalytic amounts of ZnCl₂, is described. The advantages of this method are broad scope, mild conditions, and easy handling. The comparison with the procedure based on the use of equimolar mixture of TrCl and ZnCl₂ in the presence of TEA shows that ...
DOI:
10.1016/j.tetlet.2010.11.095

25. Aflatoxin monitoring in Italian hazelnut products by LC-MS

Author:
Maria Lodovica Gullino,   et al.   ; Ambra Prelle; Davide Spadaro; Angelo Garibaldi;     Show all 4 Authors
Source:
Food additives & contaminants 2012 v.5 no.4 pp. 279-285
ISSN:
1939-3229
Subject:
acetonitrile; aflatoxins; chromatography; hazelnuts; ionization; laws and regulations; methanol; monitoring; tandem mass spectrometry; Italy
Abstract:
... Hazelnut samples of different origin were collected in stores in Northern Italy and analysed for aflatoxin (AF) contamination by a sensitive chromatographic method on the basis of a tandem mass spectrometer with electrospray ionisation. The effects of two extracting solvent mixtures (methanol/water and acetonitrile/water) and different extraction times were tested and compared in terms of recovery ...
DOI:
10.1080/19393210.2012.711371
PubMed:
24786410

26. Development and validation of a HPLC method for the assay of dapivirine in cell-based and tissue permeability experiments

Author:
Maria Fernanda Bahia,   et al.   ; José das Neves; Bruno Sarmento; Mansoor Amiji;     Show all 4 Authors
Source:
Journal of chromatography 2012 v.911 no. pp. 76-83
ISSN:
1570-0232
Subject:
RNA-directed DNA polymerase; acetonitrile; antiretroviral agents; detection limit; diphenylamine; drugs; experimental design; high performance liquid chromatography; in vitro studies; nanoparticles; permeability; storage conditions
Abstract:
... Dapivirine, a non-nucleoside reverse transcriptase inhibitor, is being currently used for the development of potential anti-HIV microbicide formulations and delivery systems. A new high-performance liquid chromatography (HPLC) method with UV detection was developed for the assay of this drug in different biological matrices, namely cell lysates, receptor media from permeability experiments and hom ...
DOI:
10.1016/j.jchromb.2012.10.034

27. Development and validation of an HPLC-DAD method for the simultaneous determination of most common rice pesticides in paddy water systems

Author:
Maria Papageorgiou,   et al.   ; Emmanouil D. Tsochatzis; Roxani Tzimou-Tsitouridou; Urania Menkissoglu-Spiroudi; Dimitrios G. Karpouzas;     Show all 5 Authors
Source:
International journal of environmental analytical chemistry 2012 v.92 no.5 pp. 548-560
ISSN:
1029-0397
Subject:
acetonitrile; azoxystrobin; basins; deltamethrin; detection limit; ecosystems; high performance liquid chromatography; metabolites; molinate; monitoring; paddies; pesticide residues; profoxydim; propanil; rice; solid phase extraction; surface water; tricyclazole; water pollution; water quality; water resources; watersheds
Abstract:
... Rice crop is mainly cultivated in large river basins which constitute unique ecosystems and their ecological quality is invaluable. However, the high loads of pesticides used in rice cultivation contribute to the contamination of the water resources in such rice-cultivated regions. To regularly monitor the quality of such water resources there is a need for a rapid and sensitive multi-residue anal ...
DOI:
10.1080/03067310903229943

28. Indirect determination of aflatoxin B1 in beer via a multi-commuted optical sensor

Author:
Maria Luisa Fernández-de Córdova,   et al.   ; Lucía Molina-García; Antonio Ruiz-Medina;     Show all 3 Authors
Source:
Food additives & contaminants 2012 v.29 no.3 pp. 392-402
ISSN:
1944-0057
Subject:
acetonitrile; aflatoxin B1; beers; carcinogenicity; chromatography; detection limit; fluorescence; hydrophobicity; silica gel; solid phase extraction; spectroscopy; ultraviolet radiation
Abstract:
... This paper reports the determination of aflatoxin B₁ (AFB₁), one of the most carcinogenic substances known. A multi-commuted flow injection–solid phase spectroscopy (FI–SPS) system combined with photochemically induced fluorescence (PIF) was developed, for the first time, for its quantitative determination. A strongly fluorescent degradation product was obtained on-line by irradiation with ultravi ...
DOI:
10.1080/19440049.2011.643244
PubMed:
22264222

29. Methodology for a rapid and simultaneous determination of total cysteine, homocysteine, cysteinylglycine and glutathione in plasma by isocratic RP-HPLC

Author:
Maria Leonor Pavão,   et al.   ; Rita Ferin; José Baptista;     Show all 3 Authors
Source:
Journal of chromatography 2012 v.911 no. pp. 15-20
ISSN:
1570-0232
Subject:
acetonitrile; biomarkers; blood plasma; cysteine; fluorescence; glutathione; homocysteine; humans; phosphates; reversed-phase high performance liquid chromatography; screening; thiols
Abstract:
... Alterations in the plasma aminothiols levels can be considered as important biomarkers for the diagnosis and screening of several human disorders, namely cardiovascular diseases. We aimed to optimize a rapid, sensitive and accurate RP-HPLC methodology with fluorescence detection, for the simultaneous determination of the total concentrations of cysteine, homocysteine, cysteinylglycine and glutathi ...
DOI:
10.1016/j.jchromb.2012.10.022

30. The influence of the organic modifier in hydro-organic mobile phase on separation selectivity of steroid hormones separation using cholesterol-bonded stationary phases

Author:
Maria Matyska,   et al.   ; Szymon Bocian; Jan Soukup; Joseph Pesek; Pavel Jandera; Bogusław Buszewski;     Show all 6 Authors
Source:
Journal of chromatography 2012 v.1245 no. pp. 90-97
ISSN:
0021-9673
Subject:
acetonitrile; adsorbents; cholesterol; chromatography; ethanol; methanol; silica; steroid hormones
Abstract:
... Chromatographic properties of four cholesterol bonded phases with different structures were studied. The columns used were packed with a stationary phase containing a cholesterol molecule attached to the silica surface using different types of linkage molecules. Columns were compared according to the retention and separation selectivity of steroid hormones. The measurements were done using binary ...
DOI:
10.1016/j.chroma.2012.05.038

31. Validation of an LC-MS/MS method for malachite green (MG), leucomalachite green (LMG), crystal violet (CV) and leucocrystal violet (LCV) residues in fish and shrimp

Author:
Maria Helena G. Diniz,   et al.   ; Jociani Ascari; Sérgio Dracz; Flávio A. Santos; J.A. Lima; Eugênia A. Vargas;     Show all 6 Authors
Source:
Food additives & contaminants 2012 v.29 no.4 pp. 602-608
ISSN:
1944-0057
Subject:
acetonitrile; cation exchange; citrates; effluents; fish; gentian violet; ionization; lead; malachite green; mass spectrometry; metabolites; monitoring; oxidation; shrimp; solid phase extraction
Abstract:
... A quantitative liquid chromatography–tandem mass spectrometry (LC-MS/MS) method for the simultaneous analyses of malachite green (MG), crystal violet (CV) and its major metabolites, leucomalachite green (LMG) and leucocrystal violet (LCV) residues in fish and shrimp samples has been validated. Fish and shrimp samples were extracted with citrate buffer/acetonitrile, and the extracts were purified o ...
DOI:
10.1080/19440049.2011.653695
PubMed:
22325002

32. Another glimpse over the salting-out assisted liquid–liquid extraction in acetonitrile/water mixtures

Author:
Inês Maria Valente,   et al.   ; Luís Moreira Gonçalves; José António Rodrigues;     Show all 3 Authors
Source:
Journal of chromatography 2013 v.1308 no. pp. 58-62
ISSN:
0021-9673
Subject:
acetates; acetonitrile; beers; carbonates; headspace analysis; high performance liquid chromatography; liquid-liquid extraction; magnesium sulfate; proteins; separation; sodium chloride; solvents
Abstract:
... The use of the salting-out effect in analytical chemistry is very diverse and can be applied to increase the volatility of the analytes in headspace extractions, to cause the precipitation of proteins in biological samples or to improve the recoveries in liquid–liquid extractions. In the latter, the salting-out process can be used to create a phase separation between water-miscible organic solvent ...
DOI:
10.1016/j.chroma.2013.08.014

33. Determination of cocaine in postmortem human liver exposed to overdose. Application of an innovative and efficient extraction/clean up procedure and gas chromatography–mass spectrometry analysis

Author:
Maria Eliana Lopes Ribeiro de Queiroz,   et al.   ; Elisângela Jaqueline Magalhães; Marcus Luiz de Oliveira Penido; Marco Antônio Ribeiro Paiva; Janaína Aparecida Reis Teodoro; Rodinei Augusti; Clésia Cristina Nascentes;     Show all 7 Authors
Source:
Journal of chromatography 2013 v.1309 no. pp. 15-21
ISSN:
0021-9673
Subject:
acetonitrile; cattle; cocaine; gas chromatography-mass spectrometry; humans; ionic strength; liver; overdose; pH; sodium chloride; solvents; temperature
Abstract:
... A simple and efficient method was developed for the determination of cocaine in post-mortem samples of human liver via solid–liquid extraction with low temperature partitioning (SLE–LTP) and analysis by gas chromatography coupled to mass spectrometry (GC–MS). The extraction procedure was optimized by evaluating the influence of the following variables: pH of the extract, volume and composition of ...
DOI:
10.1016/j.chroma.2013.08.039

34. Developments in the synthesis of a water compatible molecularly imprinted polymer as artificial receptor for detection of 3-nitro-l-tyrosine in neurological diseases

Author:
Maria Rosaria Lazzoi,   et al.   ; Lucia Mergola; Sonia Scorrano; Roberta Del Sole; Giuseppe Vasapollo;     Show all 5 Authors
Source:
Biosensors & bioelectronics 2013 v.40 pp. 336-341
ISSN:
0956-5663
Subject:
acetic acid; acetonitrile; binding properties; binding sites; biosensors; detection limit; humans; molecular imprinting; neurodegenerative diseases; oxidative stress; polymerization; polymers; solid phase extraction; urine; washing
Abstract:
... A highly selective water compatible molecularly imprinted polymer (MIP) for 3-nitro-l-tyrosine (3NT), an oxidative stress marker associated with neurodegenerative disorders, was prepared and its use as solid-phase extraction (SPE) sorbent material was demonstrated. The MIP was prepared by bulk polymerization using methacrylic acid as functional monomer and acetonitrile as porogen with traces of ac ...
DOI:
10.1016/j.bios.2012.07.074

35. Fourier Transform Near-Infrared Spectroscopy as a Reliable Method for Quick Real Time Analysis of Complex Samples in Industry

Author:
Brites Alves Ana Maria F.,   et al.   ; Pereira Carlos M. F. S.; Vieira Ana Cristina F.G.A.;     Show all 3 Authors
Source:
Industrial & Engineering Chemistry Research 2013 v.52 no.32 pp. 10873-10879
ISSN:
1520-5045
Subject:
acetone; engineering; methanol; industry; variance; models; acetonitrile; least squares; near-infrared spectroscopy; principal component analysis; water content; distillation; spectral analysis; sulfonic acids; wavelengths; titration; gas chromatography; prediction
Abstract:
... Near-infrared spectroscopy (NIRS) in conjunction with multivariate calibration have proved to be adequate techniques to predict water content as well as methanol concentration in a industrial multicomponent mixture. The calibration models were developed using real industrial complex samples of water, methanol, and several other components in variable but lower concentrations such as sulfonic acids ...
DOI:
10.1021/ie302882g

36. Influence of soil copper content on the kinetics of thiram adsorption and on thiram leachability from soils

Author:
Maria M. Vidal,   et al.   ; Olga M.S. Filipe; Carina A.E. Costa; Eduarda B.H. Santos;     Show all 4 Authors
Source:
Chemosphere 2013 v.90 pp. 432-440
ISSN:
0045-6535
Subject:
acetonitrile; adsorption; calcium chloride; copper; desorption; equations; immobilization in soil; models; soil; surface water; thiram
Abstract:
... This work aimed to assess the influence of soil copper content on the sorption processes of thiram, a fungicide widely used in agriculture, most of the times together with copper. Two different types of studies were performed: (1) desorption studies of thiram with acetonitrile after batch adsorption equilibration, and ageing of the wet soil for a variable period of time; (2) kinetic studies of thi ...
DOI:
10.1016/j.chemosphere.2012.07.057
PubMed:
22951356

37. Keys for the Existence of Stable Dimers of Bis-tetrathiafulvalene (bis-TTF)-Functionalized Molecular Clips Presenting [TTF]•+···[TTF]•+ Long, Multicenter Bonds at Room Temperature

Author:
Fumanal Maria,   et al.   ; Capdevila-Cortada Marçal; Miller Joel S.; Novoa Juan J.;     Show all 4 Authors
Source:
Journal of the American Chemical Society 2013 v.135 no.37 pp. 13814-13826
ISSN:
1520-5126
Subject:
absorption; acetonitrile; ambient temperature; geometry; solvents; spectral analysis; van der Waals forces; zwitterions
Abstract:
... A systematic theoretical and computational investigation is performed to determine the keys governing the existence, in acetonitrile solutions, of dimers of bis-tetrathiafulvalene (bis-TTF)-functionalized diphenylglycoluril molecular clips (clip₂ⁿ⁺) that are stable at room temperature for n ≤ 4. Although the experimental structure of these dimers in solution is unknown, electronic absorption studi ...
DOI:
10.1021/ja405352p

38. Reactions of Tetracyanoethylene with N′-Arylbenzamidines: A Route to 2-Phenyl-3H-imidazo[4,5-b]quinoline-9-carbonitriles

Author:
Manoli Maria,   et al.   ; Mirallai Styliana I.; Koutentis Panayiotis A.;     Show all 3 Authors
Source:
Journal of organic chemistry 2013 v.78 no.17 pp. 8655-8668
ISSN:
1520-6904
Subject:
acetonitrile; chemical structure; diphenyl ethers; imidazoles; methanol; organic chemistry; thermal degradation
Abstract:
... Eight 2-phenyl-3H-imidazo[4,5-b]quinoline-9-carbonitriles 15 are prepared in four steps from N′-arylbenzamidines 11 and tetracyanoethylene (TCNE) in ∼70–90% yields. The transformation involves the initial formation of N-aryl-N′-(1,2,2-tricyanovinyl)benzamidines 12 in 87–99% yields, which in MeCN undergo a 5-exodig cyclization to give the 2-[1-aryl-5-imino-2-phenyl-1H-imidazol-4(5H)-ylidene]malonon ...
DOI:
10.1021/jo4013699

39. Separation of phthalates by cyclodextrin modified micellar electrokinetic chromatography: Quantitation in perfumes

Author:
Maria José González; Maria Ángeles García; Maria Luisa Marina,   et al.   ; Virginia Pérez-Fernández;     Show all 4 Author
Source:
Analytica chimica acta 2013 v.782 pp. 67-74
ISSN:
0003-2670
Subject:
acetonitrile; bile salts; cyclodextrins; dimethyl phthalate; electrolytes; micellar electrokinetic capillary chromatography; pH; perfumes; sodium; surfactants; temperature
Abstract:
... A new CE method has been developed for the simultaneous separation of a group of parent phthalates. Due to the neutral character of these compounds, the addition of several bile salts as surfactants (sodium cholate (SC), sodium deoxycholate (SDC), sodium taurodeoxycholate (STDC), sodium taurocholate (STC)) to the separation buffer was explored showing the high potential of SDC as pseudostationary ...
DOI:
10.1016/j.aca.2013.03.072

40. A high-performance liquid chromatography method with pre-column derivatization for the simultaneous determination of reduced glutathione, carnosine and taurine

Author:
Maria A. Khalikova,   et al.   ; Dalibor Satinsky; Petr Solich; Alexandr A. Zinchenko; Elena T. Zhilyakova; Oleg O. Novikov;     Show all 6 Authors
Source:
Analytical methods 2014 v.6 no.5 pp. 1475-1481
ISSN:
1759-9679
Subject:
acetic acid; acetonitrile; aqueous solutions; carnosine; derivatization; glutathione; pH; reversed-phase high performance liquid chromatography; taurine; temperature; triethylamine; wavelengths
Abstract:
... A new gradient reversed-phase HPLC method with pre-column derivatization was developed and validated for simultaneous determination of reduced glutathione, carnosine and taurine in new pharmaceutical eye drops. Chromatographic separation was achieved with a fused core analytical column Supelco Ascentis Express C18 (100 mm × 4.6 mm, 2.7 μm). A 30 mM triethylamine in acetonitrile with 30 mM triethyl ...
DOI:
10.1039/c3ay42200c

41. A high-throughput method for determination of metabolites of organophosphate flame retardants in urine by ultra performance liquid chromatography–high resolution mass spectrometry

Author:
Rosa Maria Marcé,   et al.   ; Enrique Cequier; Georg Becher; Cathrine Thomsen;     Show all 4 Authors
Source:
Analytica chimica acta 2014 v.845 pp. 98-104
ISSN:
0003-2670
Subject:
acetonitrile; ammonium hydroxide; analytical chemistry; biphenyl; children; detection limit; flame retardants; formates; geometry; human health; humans; mass spectrometry; metabolites; mothers; pH; particle size; phosphates; risk; ultra-performance liquid chromatography; urine
Abstract:
... Organophosphate triesters are common flame retardants used in a wide variety of consumer products from which they can migrate and pollute the indoor environment. Humans may thus be continuously exposed to several organophosphate triesters which might be a risk for human health. An analytical method based on direct injection of 5μL urine into an ultra performance liquid chromatography system couple ...
DOI:
10.1016/j.aca.2014.06.026

42. Assessment of bacterial resistance to organic solvents using a combined confocal laser scanning and atomic force microscopy (CLSM/AFM)

Author:
Maria S. Kuyukina,   et al.   ; Irena B. Ivshina; Irina O. Korshunova; Ekaterina V. Rubtsova;     Show all 4 Authors
Source:
Journal of microbiological methods 2014 v.107 pp. 23-29
ISSN:
0167-7012
Subject:
acetonitrile; atomic force microscopy; bacteria; butanol; cell membranes; confocal laser scanning microscopy; resistance mechanisms; roughness; solvents; toluene; viability
Abstract:
... Using combined confocal laser scanning and atomic force microscopy (CLSM/AFM), bacterial viability under organic solvent stress was assessed at single cell level. Solvent-exposed bacteria stained with the LIVE/DEAD BacLight fluoresced green or red, allowing viable and dead cell discrimination. However, with toluene, butanol and acetonitrile, dually fluorescent cells appeared having compromised cel ...
DOI:
10.1016/j.mimet.2014.08.020

43. Asymmetric chemoenzymatic synthesis of N-acetyl-α-amino esters based on lipase-catalyzed kinetic resolutions through interesterification reactions

Author:
Maria da Conceição Ferreira de Oliveira; Nágila Maria Pontes Silva Ricardo,   et al.   ; Marcos Reinaldo da Silva; Marcos Carlos de Mattos; Telma Leda Gomes de Lemos; Gonzalo de Gonzalo; Iván Lavandera; Vicente Gotor-Fernández; Vicente Gotor;     Show all 9 Authors
Source:
Tetrahedron 2014 v.70 pp. 2264-2271
ISSN:
0040-4020
Subject:
Rhizomucor miehei; acetonitrile; acid hydrolysis; butyrates; carboxylic ester hydrolases; catalysts; chemical structure; esterification; halides; phenylalanine; stereochemistry
Abstract:
... Several phenylalanine analogs have been synthesized through a four-step route starting from easily available ethyl acetamidocyanoacetate. In a first reaction, and making use of phase transfer catalysts, this compound reacted with several alkyl halides, being benzyltributylammonium chloride identified as the best one for the production of a series of quaternary amino acids in moderate to excellent ...
DOI:
10.1016/j.tet.2014.02.012

44. Bioactive Metabolites Produced by Penicillium sp.1 and sp.2, Two Endophytes Associated with Alibertia macrophylla (Rubiaceae)

Author:
Maria C. M. Young,   et al.   ; Camila M. Oliveira; Geraldo H. Silva; Luis O. Regasini; Lisinéia M. Zanardi; Alana H. Evangelista; Vanderlan S. Bolzani; Angela R. Araujo;     Show all 8 Authors
Source:
Zeitschrift für Naturforschung 2014 v.64 no.11-12 pp. 824-830
ISSN:
1865-7125
Subject:
Cladosporium cladosporioides; Penicillium; Rubiaceae; acetonitrile; acetylcholinesterase; active ingredients; chromatography; corn; endophytes; fractionation; fungi; leaves; metabolites; uracil
Abstract:
... In the course of our continuous search for bioactive metabolites from endophytic fungi living in plants from the Brazilian fl ora, leaves of Alibertia macrophylla (Rubiaceae) were submitted to isolation of endophytes, and two species of Penicillium were isolated. The acetonitrile fraction obtained in corn from a culture of Penicillium sp.1 afforded orcinol (1). On the other hand, Penicillium sp.1 ...
DOI:
10.1515/znc-2009-11-1212

45. Correlations between the zeta potentials of silica hydride-based stationary phases, analyte retention behaviour and their ionic interaction descriptors

Author:
Maria T. Matyska,   et al.   ; Chadin Kulsing; Yuanzhong Yang; Caesar Munera; Colby Tse; Joseph J. Pesek; Reinhard I. Boysen; Milton T.W. Hearn;     Show all 8 Authors
Source:
Analytica chimica acta 2014 v.817 pp. 48-60
ISSN:
0003-2670
Subject:
acetonitrile; analytical chemistry; chromatography; energy; formic acid; hydrides; silica; zeta potential
Abstract:
... In this study, the zeta potentials of type-B silica, bare silica hydride, the so-called Diamond Hydride™ and phenyl substituted silica hydride stationary phases have been measured in aqueous-organic media and correction procedures developed to account for the more negative zeta potential values in media containing different acetonitrile contents. Retention studies of 16 basic, acidic and neutral c ...
DOI:
10.1016/j.aca.2014.01.054

46. Determination of ethyl carbamate in spirits using salting-out assisted liquid–liquid extraction and high performance liquid chromatography with fluorimetric detection

Author:
Inês Maria Valente,   et al.   ; Rui Miguel Ramos; Luís Moreira Gonçalves; José António Rodrigues;     Show all 4 Authors
Source:
Analytical methods 2014 v.6 no.22 pp. 9136-9141
ISSN:
1759-9679
Subject:
acetonitrile; derivatization; detection limit; ethyl carbamate; fluorometry; high performance liquid chromatography; hydrochloric acid; liquid-liquid extraction; reversed-phase liquid chromatography; separation; sodium chloride; solvents; toxicity
Abstract:
... In this work, a simple methodology was developed for the determination of ethyl carbamate (EC) in spirits by high performance liquid chromatography with fluorimetric detection. The sample is subjected to salting-out assisted liquid–liquid extraction (SALLE) using a 9-xanthydrol/acetonitrile solution for the simultaneous extraction and derivatisation of EC. Extraction/derivatization occurs under ac ...
DOI:
10.1039/c4ay02075h

47. Determination of hormonally active chlorinated chemicals in waters at sub µg/L level using stir bar sorptive extraction-liquid desorption followed by negative chemical ionization-gas chromatography triple quadrupole mass spectrometry

Author:
Maria Jose Gómez,   et al.   ; Sridhara Chary Nallanthigal; Sonia Herrera; Amadeo. R. Fernández-Alba;     Show all 4 Authors
Source:
International journal of environmental analytical chemistry 2014 v.94 no.1 pp. 48-64
ISSN:
1029-0397
Subject:
acetonitrile; desorption; detection limit; effluents; endosulfan; environmental quality; gas chromatography; ionization; mass spectrometry; mechanization; mixing; river water; screening; sodium chloride; surface water; wastewater; water policy; Spain
Abstract:
... A new analytical method has been developed for the screening, evaluation and determination of sub µg/L concentrations of chlorinated chemicals in environmental waters. Ten different compounds included in the European water policy have been considered and determined by stir bar sorptive extraction (SBSE) followed by liquid desorption and negative chemical ionization gas chromatography coupled to tr ...
DOI:
10.1080/03067319.2013.775278

48. Do Molecular Gelators Cluster in Hansen Space?

Author:
Maria G. Corradini,   et al.   ; Yaqi Lan; Michael A. Rogers;     Show all 3 Authors
Source:
Crystal Growth & Design 2014 v.14 no.9 pp. 4811-4818
ISSN:
1528-7505
Subject:
acetonitrile; benzene; design; ethanol; gelation; gels; hydrogen bonding; liquids; molecular weight; prediction; solubility; toluene
Abstract:
... Hansen solubility parameters (HSP) aid in the a priori prediction of which low molecular weight molecules have the potential to act as low molecular weight organogelators (LMOGs) and can immobilize certain liquids. The hydrogen-bonding HSP parameter individually has some predictive capacity on whether a molecule will form a gel, solution, or precipitate in a known liquid; in the case of benzene, g ...
DOI:
10.1021/cg500985e
CHORUS:
10.1021/cg500985e

49. Molecularly imprinted polymer beads for nicotine recognition prepared by RAFT precipitation polymerization: a step forward towards multi-functionalities

Author:
Maria Ahlm Mattebjerg,   et al.   ; Tongchang Zhou; Lars Jørgensen; Ioannis S. Chronakis; Lei Ye;     Show all 5 Authors
Source:
RSC advances 2014 v.4 no.57 pp. 30292-30299
ISSN:
2046-2069
Subject:
acetonitrile; fluorescent dyes; hydrophilicity; molecular imprinting; nicotine; polymerization; polymers; thiols
Abstract:
... A nicotine imprinted polymer was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization using methacrylic acid (MAA) as a functional monomer. The resulting molecularly imprinted polymers were monodispersed beads with an average diameter of 1.55 μm. The molecular selectivity of the imprinted polymer beads was evaluated by studying the uptake of nicotine and its struct ...
DOI:
10.1039/c4ra04741a

50. Multi-residue and multi-class determination of antibiotics in gilthead sea bream (Sparus aurata) by ultra high-performance liquid chromatography-tandem mass spectrometry

Author:
Maria da Conceição Castilho,   et al.   ; Andreia Freitas; Sara Leston; João Rosa; Jorge Barbosa; Paulo Rema; Miguel Ângelo Pardal; Fernando Ramos;     Show all 8 Authors
Source:
Food additives & contaminants 2014 v.31 no.5 pp. 817-826
ISSN:
1944-0057
Subject:
Sparus aurata; acetic acid; acetonitrile; chloramphenicol; fish culture; macrolides; maximum residue limits; muscles; penicillins; quinolones; sulfonamides; tandem mass spectrometry; tetracyclines; trimethoprim; ultra-performance liquid chromatography
Abstract:
... This paper describes a method for the determination of 41 antibiotics from seven different classes in gilthead sea bream (Sparus aurata) by ultra-high-performance liquid chromatography with tandem mass spectrometry (UPLC-MS/MS). Sulfonamides, trimethoprim, tetracyclines, macrolides, quinolones, penicillins and chloramphenicol were simultaneously determined. Fourteen procedures for sample treatment ...
DOI:
10.1080/19440049.2014.891764

51. Multiresidue Screening Method for Detection of Benzimidazoles and their Metabolites in Liver and Muscle by High-Performance Liquid Chromatography: Method Development and Validation According to Commission Decision 2002/657/EC

Author:
Maria Cesarina Abete,   et al.   ; Marilena Gili; Marino Prearo; Paola Stella; Federica Ostorero;     Show all 5 Authors
Source:
Italian journal of food safety 2014 v.3 no.1 pp. -
ISSN:
2239-7132
Subject:
acetonitrile; albendazole; ammonium hydroxide; animal-based foods; benzimidazole; cation exchange; cattle; detectors; drug residues; fenbendazole; fish; flubendazole; fluorescence; food safety; hexane; high performance liquid chromatography; horses; hydrochloric acid; liver; mebendazole; metabolites; muscles; oxfendazole; oxibendazole; poultry; qualitative analysis; rabbits; screening; sheep; solid phase extraction; solvents; swine; thiabendazole; veterinary drugs
Abstract:
... The use of veterinary drugs may cause the presence of residues in food of animal origin if appropriate withdrawal periods are not respected. A high-performance liquid chromatography (HPLC) method has been developed for the simultaneous detection of 11 benzimidazole residues, including metabolites – albendazole, albendazole sulphoxide, albendazole sulphone, fenbendazole, fenbendazole sulphoxide (ox ...
DOI:
10.4081/ijfs.2014.1640
PubMed:
27800310
PubMed Central:
PMC5076660

52. On-line SPE–UHPLC method using fused core columns for extraction and separation of nine illegal dyes in chilli-containing spices

Author:
Maria A. Khalikova,   et al.   ; Dalibor Šatínský; Tereza Šmidrkalová; Petr Solich;     Show all 4 Authors
Source:
Talanta 2014 v.130 pp. 433-441
ISSN:
0039-9140
Subject:
European Union; Sudan dyes; acetonitrile; chromatography; detection limit; quantitative analysis; sorbents; spices; statistical analysis; temperature
Abstract:
... The presented work describes the development of a simple, fast and effective on-line SPE–UHPLC–UV/vis method using fused core particle columns for extraction, separation and quantitative analysis of the nine illegal dyes, most frequently found in chilli-containing spices. The red dyes Sudan I–IV, Sudan Red 7B, Sudan Red G, Sudan Orange G, Para Red, and Methyl Red were separated and analyzed in les ...
DOI:
10.1016/j.talanta.2014.07.038

53. Optimisation of a sample preparation method for the determination of fumonisin B1 in rice

Author:
Maria Isabel Rodrigues; Célia Maria de Sylos,   et al.   ; Mateus Henrique Petrarca; Elizeu Antonio Rossi;     Show all 4 Authors
Source:
Food chemistry 2014 v.158 pp. 270-277
ISSN:
0308-8146
Subject:
acetic acid; acetonitrile; aqueous solutions; cost effectiveness; derivatization; detection limit; diatomaceous earth; experimental design; fumonisin B1; rice; sodium chloride; sodium sulfate; Brazil
Abstract:
... A simple, rapid and cost-effective sample preparation method for the determination of fumonisin B1 in rice was optimised using a strategy of sequential experimental designs. Initially, a Plackett–Burman design was applied to select the statistically significant variables for the determination of fumonisin B1, and then, a central composite rotatable design was used to define the optimal conditions ...
DOI:
10.1016/j.foodchem.2014.02.126

54. Phospholipid removal combined with a semi-automated 96-well SPE application for determination of budesonide in human plasma with LC–MS/MS

Author:
Maria Andersson,   et al.   ; Karin Nilsson; Olof Beck;     Show all 3 Authors
Source:
Journal of Chromatography B 2014 v.970 pp. 31-35
ISSN:
1570-0232
Subject:
acetonitrile; automation; formic acid; humans; ionization; liquid chromatography; monitoring; pharmacokinetics; phospholipids; quality control; solid phase extraction; tandem mass spectrometry
Abstract:
... A semi-automated method for quantification of budesonide in human plasma was developed, validated, and applied for high-volume analysis of samples in connection with a pharmacokinetic study. Protein and phospholipid removal was performed using an Ostro 96-well filter plate and subsequently combined with C18 solid-phase extraction on a Hamilton Microlab STARlet automation robot. The final extracts ...
DOI:
10.1016/j.jchromb.2014.08.035

55. Prediction of the retention of s‐triazines in reversed‐phase high‐performance liquid chromatography under linear gradient‐elution conditions

Author:
Maria Anna Maggi,   et al.   ; Angelo Antonio D'Archivio; Fabrizio Ruggieri;     Show all 3 Authors
Source:
Journal of separation science 2014 v.37 no.15 pp. 1930-1936
ISSN:
1615-9306
Subject:
acetonitrile; chemical structure; herbicides; metabolites; model validation; neural networks; prediction; response surface methodology; reversed-phase high performance liquid chromatography; solutes; triazines
Abstract:
... In this paper, a multilayer artificial neural network is used to model simultaneously the effect of solute structure and eluent concentration profile on the retention of s‐triazines in reversed‐phase high‐performance liquid chromatography under linear gradient elution. The retention data of 24 triazines, including common herbicides and their metabolites, are collected under 13 different elution mo ...
DOI:
10.1002/jssc.201400346
PubMed:
24830601

56. Study of hydration process on silica hydride surfaces by microcalorimetry and water adsorption

Author:
Maria Matyska,   et al.   ; Szymon Bocian; Gerhard Rychlicki; Joseph Pesek; Bogusław Buszewski;     Show all 5 Authors
Source:
Journal of colloid and interface science 2014 v.416 pp. 161-166
ISSN:
0021-9797
Subject:
acetonitrile; adsorption; calorimetry; hydrides; hydrophobicity; ligands; liquid chromatography; methanol; silica gel
Abstract:
... A series of hydrosilated stationary phases were compared with respect to their hydrophilic–hydrophobic properties. The stationary phases were also compared to the bare silica gel used for this synthesis. The investigations were done using microcalorimetric measurements of methanol and acetonitrile heats of immersion. Because these stationary phases are used in both the reversed-phase and aqueous n ...
DOI:
10.1016/j.jcis.2013.10.042

57. Synthesis of Fused 1,2,4-Dithiazines and 1,2,3,5-Trithiazepines

Author:
Koyioni Maria; Manoli Maria,   et al.   ; Koutentis Panayiotis A.;     Show all 3 Author
Source:
Journal of organic chemistry 2014 v.79 no.20 pp. 9717-9727
ISSN:
1520-6904
Subject:
acetonitrile; organic chemistry; sulfur; sulfuric acid; thermal degradation
Abstract:
... Reacting (Z)-N-(4-chloro-5H-1,2,3-dithiazol-5-ylidene)-1H-pyrazol-5-amines 5 with Et₂NH and then with concd H₂SO₄ gives 5H-pyrazolo[3,4-e][1,2,4]dithiazine-3-carbonitriles 7 in good yields (74–85%) and 6H-pyrazolo[3,4-f][1,2,3,5]trithiazepine-4-carbonitriles 9 as minor products (0–6%). Furthermore, the 1,3-dimethylpyrazole analogue 5a was transformed into the dithiazine 7a in two discrete steps, a ...
DOI:
10.1021/jo501881y

58. AC electric field for rapid assembly of nanostructured polyaniline onto microsized gap for sensor devices

Author:
Antonella Maria,   et al.   ; Vera La Ferrara; Gabriella Rametta;     Show all 3 Authors
Source:
Electrophoresis 2015 v.36 no.13 pp. 1459-1465
ISSN:
0173-0835
Subject:
acetonitrile; air; ammonia; dielectrophoresis; electric current; electric field; electrodes; electrophoresis; nanomaterials; prototypes; temperature
Abstract:
... Interconnected network of nanostructured polyaniline (PANI) is giving strong potential for enhancing device performances than bulk PANI counterparts. For nanostructured device processing, the main challenge is to get prototypes on large area by requiring precision, low cost and high rate assembly. Among processes meeting these requests, the alternate current electric fields are often used for nano ...
DOI:
10.1002/elps.201400550

59. Bioinspired Tungsten Dithiolene Catalysts for Hydrogen Evolution: A Combined Electrochemical, Photochemical, and Computational Study

Author:
Gomez-Mingot Maria,   et al.   ; Porcher Jean-Philippe; Todorova Tanya K.; Fogeron Thibault; Mellot-Draznieks Caroline; Li Yun; Fontecave Marc;     Show all 7 Authors
Source:
Journal of physical chemistry 2015 v.119 no.43 pp. 13524-13533
ISSN:
1520-5207
Subject:
acetonitrile; active sites; ascorbic acid; catalysts; electrochemistry; electrolysis; formates; hydrogen; hydrogen production; irradiation; photochemistry; photosensitizing agents; protons; tungsten
Abstract:
... Bis(dithiolene)tungsten complexes, WⱽᴵO₂ (L = dithiolene)₂ and WᴵⱽO (L = dithiolene)₂, which mimic the active site of formate dehydrogenases, have been characterized by cyclic voltammetry and controlled potential electrolysis in acetonitrile. They are shown to be able to catalyze the electroreduction of protons into hydrogen in acidic organic media, with good Faradaic yields (75–95%) and good acti ...
DOI:
10.1021/acs.jpcb.5b01615

60. Determination of sulfonamide antibiotics and metabolites in liver, muscle and kidney samples by pressurized liquid extraction or ultrasound-assisted extraction followed by liquid chromatography–quadrupole linear ion trap-tandem mass spectrometry (HPLC–QqLIT-MS/MS)

Author:
Maria do Carmo Ruaro Peralba,   et al.   ; Rodrigo Barcellos Hoff; Tânia Mara Pizzolato; M. Silvia Díaz-Cruz; Damià Barceló;     Show all 5 Authors
Source:
Talanta 2015 v.134 pp. 768-778
ISSN:
0039-9140
Subject:
acetonitrile; antibiotics; detection limit; hexane; kidneys; liquid chromatography; liquid-liquid extraction; liquids; liver; mass spectrometry; metabolites; muscles; sulfonamides; ultrasonic treatment; veterinary medicine
Abstract:
... Sulfonamides are widely used in human and veterinary medicine. The presence of sulfonamides residues in food is an issue of great concern. Throughout the present work, a method for the targeted analysis of 16 sulfonamides and metabolites residue in liver of several species has been developed and validated. Extraction and clean-up has been statistically optimized using central composite design expe ...
DOI:
10.1016/j.talanta.2014.10.045

61. Determination of γ‐hydroxybutyric acid in saliva by capillary electrophoresis coupled with contactless conductivity and indirect UV absorbance detectors

Author:
Maria Kulp,   et al.   ; Jekaterina Mazina; Piret Saar‐Reismaa; Mihkel Kaljurand; Merike Vaher;     Show all 5 Authors
Source:
Electrophoresis 2015 v.36 no.24 pp. 3042-3049
ISSN:
0173-0835
Subject:
absorbance; acetonitrile; arginine; capillary electrophoresis; cetyltrimethylammonium bromide; detectors; forensic sciences; maleic acid; saliva; screening
Abstract:
... The aim of the current study was to optimise and validate the methodology for determination of γ‐hydroxybutyric acid (GHB) in saliva by CE combined with a contactless conductivity detector (C⁴D) and indirect UV absorbance detection (λABS = 210 nm). The optimized BGE, consisting of 8.5 mM maleic acid, 17 mM arginine, 255 μM cetyltrimethylammonium bromide (CTAB), and 15% acetonitrile, was evaluated ...
DOI:
10.1002/elps.201500293

62. Evaluation of different QuEChERS procedures for the recovery of selected drugs and herbicides from soil using LC coupled with UV and pulsed amperometry for their detection

Author:
Rosa Maria De Carlo; Maria Concetta Bruzzoniti,   et al.   ; Luca Rivoira; Lorenzo Ciofi; Claudia Ancillotti; Leonardo Checchini; Massimo Del Bubba;     Show all 7 Authors
Source:
Analytical and bioanalytical chemistry 2015 v.407 no.4 pp. 1217-1229
ISSN:
1618-2642
Subject:
acetic acid; acetonitrile; atrazine; bentazon; detection limit; glassy carbon electrode; liquid chromatography; metabolites; microwave treatment; phenytoin; physicochemical properties; rehydration; salts; soil; solid phase extraction
Abstract:
... Seven quick, easy, cheap, effective, rugged and safe (QuEChERS)-based procedures, differing in both the extraction and clean-up steps, were investigated for the recovery of bentazone (BTZ), atrazine (ATZ), carbamazepine (CBZ), phenytoin (PNT) and its metabolite 5-(p-hydroxyphenyl-),5-phenylhydantoin (HPPH) from soil. Target analytes were chosen for their extensive use and/or occurrence in soil, as ...
DOI:
10.1007/s00216-014-8339-x

63. Experimental Mixture Design as a Tool for the Synthesis of Antimicrobial Selective Molecularly Imprinted Monodisperse Microbeads

Author:
Moreno-Bondi Maria C.,   et al.   ; Benito-Peña Elena; Navarro-Villoslada Fernando; Carrasco Sergio; Jockusch Steffen; Ottaviani M. Francesca;     Show all 6 Authors
Source:
ACS Applied Materials & Interfaces 2015 v.7 no.20 pp. 10966-10976
ISSN:
1944-8252
Subject:
acetonitrile; adsorption; binding sites; chemometrics; electron paramagnetic resonance spectroscopy; enrofloxacin; ethylene glycol; fluoroquinolones; hydrophilicity; light scattering; microbeads; molecular imprinting; nitrogen; particle size; polymerization; polymers; scanning electron microscopy
Abstract:
... The effect of the cross-linker on the shape and size of molecular imprinted polymer (MIP) beads prepared by precipitation polymerization has been evaluated using a chemometric approach. Molecularly imprinted microspheres for the selective recognition of fluoroquinolone antimicrobials were prepared in a one-step precipitation polymerization procedure using enrofloxacin (ENR) as the template molecul ...
DOI:
10.1021/acsami.5b02238

64. Improved determination of malonaldehyde by high-performance liquid chromatography with UV detection as 2,3-diaminonaphthalene derivative

Author:
Luca Maria Chiesa,   et al.   ; Sara Panseri; Andrea Brizzolari; Enzo Santaniello; Elena Passerò; Pier Antonio Biondi;     Show all 6 Authors
Source:
Journal of Chromatography B 2015 v.976-977 pp. 91-95
ISSN:
1570-0232
Subject:
absorption; acetonitrile; detection limit; fish fillets; high performance liquid chromatography; liquid-liquid extraction; mackerel; malondialdehyde; pH; system optimization
Abstract:
... A rapid, specific and simple procedure is proposed for the determination of free malonaldehyde (MA) contained in fish tissue. The method is the optimization of the reaction of MA with 2,3-diaminonaphthalene to afford a naphtodiazepinium ion that present a UV absorption at 311nm, useful for MA determination by HPLC with UV detection. The reaction proceeds in the presence of 25% acetonitrile at 37°C ...
DOI:
10.1016/j.jchromb.2014.11.017

65. Insight into the retention mechanism on immobilized artificial membrane chromatography using two stationary phases

Author:
Maria Ochsenkühn-Petropoulou,   et al.   ; Fotios Tsopelas; Niki Malaki; Theodosia Vallianatou; Marios Chrysanthakopoulos; Demetris Vrakas; Anna Tsantili-Kakoulidou;     Show all 7 Authors
Source:
Journal of chromatography 2015 v.1396 pp. 25-33
ISSN:
0021-9673
Subject:
acetonitrile; chromatography; drugs; electrostatic interactions; lipophilicity; pH; zwitterions
Abstract:
... The retention behavior of sixty structurally diverse drugs on two immobilized artificial membrane (IAM) columns, IAM.PC.MG and IAM.PC.DD2 types, at two pH values, 7.4 and 5.5, was established. Extrapolated to pure aqueous phase retention factors, logkw(IAM), were determined and the role of acetonitrile as organic modifier was explored, considering the relationships with the slopes, S, of the extra ...
DOI:
10.1016/j.chroma.2015.03.060

66. Ion-Pair Chromatography Coupled to Inductively Coupled Plasma–Mass Spectrometry (IPC-ICP-MS) as a Method for Thiomolybdate Speciation in Natural Waters

Author:
Reithmaier Gloria Maria Susanne,   et al.   ; Lohmayer Regina; Bura-Nakić Elvira; Planer-Friedrich Britta;     Show all 4 Authors
Source:
Analytical chemistry 2015 v.87 no.6 pp. 3388-3395
ISSN:
1520-6882
Subject:
acetonitrile; anaerobic conditions; atomic absorption spectrometry; carbon; detection limit; hydrolysis; ion pair chromatography; ionic strength; isopropyl alcohol; molybdenum; pH; sediments; solvents; sulfides; thiomolybdates
Abstract:
... Molybdenum precipitates preferentially under reducing conditions; therefore, its occurrence in sediment records is used as an indicator of paleoredox conditions. Although thiomolybdates (MoO₄–ₓSₓ²– with x = 1–4) supposedly are necessary intermediates in the process of molybdenum precipitation under anoxic conditions, there is no information about their abundance in natural environments, because of ...
DOI:
10.1021/ac5046406

67. Molecularly imprinted polymers for cleanup and selective extraction of curcuminoids in medicinal herbal extracts

Author:
Maria C. Moreno-Bondi,   et al.   ; Meyliana Wulandari; Javier L. Urraca; Ana B. Descalzo; M. Bachri Amran;     Show all 5 Authors
Source:
Analytical and bioanalytical chemistry 2015 v.407 no.3 pp. 803-812
ISSN:
1618-2642
Subject:
acetonitrile; ammonium acetate; binding capacity; curcumin; dimethyl sulfoxide; ethylene glycol; fluorescence; high performance liquid chromatography; methanol; models; molecular imprinting; pH; polymers; solid phase extraction; sorption isotherms; washing
Abstract:
... This paper describes the synthesis of novel molecularly imprinted polymers (MIPs), prepared by a noncovalent imprinting approach, for cleanup and preconcentration of curcumin (CUR) and bisdemethoxycurcumin (BDMC) from medicinal herbal extracts and further analysis by high-performance liquid chromatography with fluorescence detection (HPLC-FLD). Two molecular mimics, a mixture of reduced BDMCs and ...
DOI:
10.1007/s00216-014-8011-5

68. Prediction of the zeta potentials and ionic descriptors of a silica hydride stationary phase with mobile phases of different pH and ionic strength

Author:
Maria T. Matyska,   et al.   ; Chadin Kulsing; Yuanzhong Yang; Joseph J. Pesek; Reinhard I. Boysen; Milton T.W. Hearn;     Show all 6 Authors
Source:
Analytica chimica acta 2015 v.859 pp. 79-86
ISSN:
0003-2670
Subject:
acetonitrile; analytical chemistry; chromatography; dissociation; energy; hydrides; ion exchange; ionic strength; pH; prediction; refractive index; silica; viscosity; zeta potential
Abstract:
... In this study, the zeta potentials of a silica hydride stationary phase (Diamond Hydride™) in the presence of different water–acetonitrile mixtures (from 0–80% (v/v) acetonitrile) of different ionic strengths (from 0–40mM) and pH values (from pH 3.0–7.0) have been investigated. Debye–Hückel theory was applied to explain the effect of changes in the pH and ionic strength of these aqueous media on t ...
DOI:
10.1016/j.aca.2014.10.055

69. Quantitative analysis of pungent and anti-inflammatory phenolic compounds in olive oil by capillary electrophoresis

Author:
Maria Halabalaki,   et al.   ; Isabella Vulcano; Leandros Skaltsounis; Markus Ganzera;     Show all 4 Authors
Source:
Food chemistry 2015 v.169 pp. 381-386
ISSN:
0308-8146
Subject:
acetonitrile; borax; buffers; capillary electrophoresis; high performance liquid chromatography; oleocanthal; olive oil; pH; quantitative analysis; secoiridoids; solvents
Abstract:
... The first CE procedure for the quantitative determination of pharmacologically relevant secoiridoids in olive oil, oleocanthal and oleacein, is described. Together with their precursors tyrosol and hydroxytyrosol they could be baseline separated in less than 15min using a borax buffer with pH 9.5, at 25kV and 30°C. Method validation confirmed that the procedure is selective, accurate (recovery rat ...
DOI:
10.1016/j.foodchem.2014.08.007

70. Rapid extraction of melamine in powdered milk for direct electrospray ionization tandem mass spectrometry analysis

Author:
Sandra Maria Pinto,   et al.   ; Elisângela do Carmo Domingo; Aline Auxiliadora Tireli; Cleiton Antonio Nunes; Alexandre Vieira Batista; Mário César Guerreiro;     Show all 6 Authors
Source:
Talanta 2015 v.132 pp. 535-540
ISSN:
0039-9140
Subject:
acetonitrile; detection limit; dried milk; electrospray ionization mass spectrometry; ethyl acetate; hydrogen; infrared spectroscopy; melamine; microscopy; milk; statistical analysis; sulfuric acid; trichloroacetic acid
Abstract:
... A combination of a simple pretreatment for melamine extraction and direct analysis in electrospray ionization tandem mass spectrometry (ESI–MS/MS) is proposed. Three pretreatments were evaluated. The first was based on suppressing interference using acetonitrile. The second used sulphuric acid and trichloroacetic acid to suppress interference and for melamine extraction, respectively. The third us ...
DOI:
10.1016/j.talanta.2014.10.003

71. Synthesis and Redox Properties of Thiophene Terephthalate Building Blocks for Low-Potential Conducting Redox Polymers

Author:
Strømme Maria,   et al.   ; Huang Xiao; Yang Li; Bergquist Jonas; Gogoll Adolf; Sjödin Martin;     Show all 6 Authors
Source:
The Journal of Physical Chemistry C 2015 v.119 no.49 pp. 27247-27254
ISSN:
1932-7455
Subject:
acetonitrile; anodes; electrochemistry; lithium batteries; models; physical chemistry; polymers; solutes; solvents; spectroscopy; thiophene
Abstract:
... Terephthalate-substituted thiophene derivatives are promising redox-active components for anode materials in lithium-ion batteries. In this study, we present the synthesis of substituted 2-(thiophen-3-yl)terephthalate derivatives (TTDs) as suitable monomers for thiophene-based conducting redox polymers, along with their characterization by electrochemical and spectroscopic techniques. Density func ...
DOI:
10.1021/acs.jpcc.5b08518

72. Templated Electrodeposition and Photocatalytic Activity of Cuprous Oxide Nanorod Arrays

Author:
Quintana Maria,   et al.   ; Haynes Keith M.; Perry Collin M.; Rivas Marlene; Golden Teresa D.; Bazan Antony; Nesterov Vladimir N.; Berhe Seare A.; Rodríguez Juan; Estrada Walter; Youngblood W. Justin;     Show all 11 Authors
Source:
ACS applied materials 2015 v.7 no.1 pp. 830-837
ISSN:
1944-8252
Subject:
acetonitrile; coatings; cuprous oxide; electrolytes; nanopores; nanorods; paraquat; photocatalysis; polylactic acid; zinc oxide
Abstract:
... Cuprous oxide (Cu₂O) nanorod arrays have been prepared via a novel templated electrodeposition process and were characterized for their photocatalytic behavior in nonaqueous photoelectrochemical cells. Zinc oxide (ZnO) nanorod films serve as sacrificial templates for the in situ formation of polymer nanopore membranes on transparent conductive oxide substrates. Nitrocellulose and poly(lactic acid) ...
DOI:
10.1021/am507244q

73. The development of a new disposable pipette extraction phase based on polyaniline composites for the determination of levels of antidepressants in plasma samples

Author:
Maria Eugênia C. Queiroz,   et al.   ; Andréa R. Chaves; Bruno H.F. Moura; Juciene A. Caris; Denilson Rabelo;     Show all 5 Authors
Source:
Journal of chromatography 2015 v.1399 pp. 1-7
ISSN:
0021-9673
Subject:
acetonitrile; antidepressants; borates; composite polymers; desorption; fluorescence; liquid chromatography; liquids; pH; patients; solvents; therapeutics
Abstract:
... In the present work, a new stationary phase for disposable pipette extraction (DPX) based on composites of polyaniline and a styrene–divinylbenzene (SD) copolymer was applied to the analysis of fluoxetine and norfluoxetine in plasma samples using liquid chromatography and fluorescence detector (LC–FD).The DPX variables, such as number of draw/eject cycles, sample pH, type and volume of the desorpt ...
DOI:
10.1016/j.chroma.2015.04.027

74. UV-induced reactions of Mg2+-doped anatase nanocrystals with exposed {001} facets: An EPR study

Author:
Maria-Veronica Sofianou,   et al.   ; Zuzana Barbieriková; Dana Dvoranová; Christos Trapalis; Vlasta Brezová;     Show all 5 Authors
Source:
Journal of catalysis 2015 v.331 pp. 39-48
ISSN:
0021-9517
Subject:
acetonitrile; air; cations; dispersions; electron paramagnetic resonance spectroscopy; fluorides; irradiation; nanocrystals; oxidation; sodium hydroxide; superoxide anion; titanium dioxide; washing
Abstract:
... The photoinduced processes of pristine and Mg²⁺-doped anatase nanopowders with the exposed {001} facets synthesized by a solvothermal method, using HF as the capping agent, were investigated by EPR spectroscopy. The adsorbed fluoride ions on the {001} facets of the as-prepared anatase samples have been removed by NaOH washing (washed samples) or calcination at 600°C (calcined samples). EPR spectra ...
DOI:
10.1016/j.jcat.2015.08.009

75. Wittig Reaction: Domino Olefination and Stereoselectivity DFT Study. Synthesis of the Miharamycins’ Bicyclic Sugar Moiety

Author:
Calhorda Maria José,   et al.   ; Cachatra Vasco; Almeida Andreia; Sardinha João; Lucas Susana D.; Gomes Ana; Vaz Pedro D.; Florêncio M. Helena; Nunes Rafael; Vila-Viçosa Diogo; Rauter Amélia P.;     Show all 11 Authors
Source:
Organic letters 2015 v.17 no.22 pp. 5622-5625
ISSN:
1523-7052
Subject:
acetonitrile; chloroform; enols; microwave radiation; moieties; regioselectivity; stereoselectivity; sugars; tautomerization
Abstract:
... 2-O-Acyl protected-d-ribo-3-uloses reacted with [(ethoxycarbonyl)methylene]triphenylphosphorane in acetonitrile to afford regio- and stereoselectively 2-(Z)-alkenes in 10–60 min under microwave irradiation. This domino reaction is proposed to proceed via tautomerization of 3-ulose to enol, acyl migration, tautomerization to the 3-O-acyl-2-ulose, and Wittig reaction. Alternatively, in chloroform, r ...
DOI:
10.1021/acs.orglett.5b02849

76. A simple, fast and sensitive screening LC-ESI-MS/MS method for antibiotics in fish

Author:
Maria Beatriz A. Gloria,   et al.   ; Letícia Rocha Guidi; Flávio Alves Santos; Ana Cláudia S.R. Ribeiro; Christian Fernandes; Luiza H.M. Silva;     Show all 6 Authors
Source:
Talanta 2016 pp. -
ISSN:
0039-9140
Subject:
acetonitrile; aminoglycosides; aquaculture; beta-lactams; detection limit; enrofloxacin; fish; guidelines; ionization; macrolides; monitoring; screening; sulfonamides; tandem mass spectrometry; tetracyclines; trichloroacetic acid
Abstract:
... The objective of this study was to develop and validate a fast, sensitive and simple liquid chromatography–electrospray ionization-tandem mass spectrometry (LC–ESI-MS/MS) method for the screening of six classes of antibiotics (aminoglycosides, beta-lactams, macrolides, quinolones, sulfonamides and tetracyclines) in fish. Samples were extracted with trichloroacetic acid. LC separation was achieved ...
DOI:
10.1016/j.talanta.2016.10.089

77. Analysis of tricyclic antidepressants in human plasma using online-restricted access molecularly imprinted solid phase extraction followed by direct mass spectrometry identification/quantification

Author:
Isabela Maria Campos Tavares,   et al.   ; Mariane Gonçalves Santos; Adriano Francisco Barbosa; Jefferson Bettini; Eduardo Costa Figueiredo;     Show all 5 Authors
Source:
Talanta 2016 pp. -
ISSN:
0039-9140
Subject:
acetic acid; acetonitrile; antidepressants; aqueous solutions; bovine serum albumin; chromatography; correlation; humans; hydrophilicity; mass spectrometry; molecular imprinting; polymers; solid phase extraction; spectrometers
Abstract:
... The use of a new class of hybrid materials, called restricted access molecularly imprinted polymers (RAMIPs) seems to present a good strategy for the sample preparation of complex matrices, since these materials combine good protein elimination capacity with high degree selectivity. Mass spectrometers (MS) have been successfully used for polar drug identification and quantification. In order to co ...
DOI:
10.1016/j.talanta.2016.10.047

78. Development of a modified acetonitrile-based extraction procedure followed by ultra-high performance liquid chromatography–tandem mass spectrometry for the analysis of psychiatric drugs in sediments

Author:
Maria João Ramalhosa,   et al.   ; Lúcia H.M.L.M. Santos; Marta Ferreira; Cristina Delerue-Matos;     Show all 4 Authors
Source:
Journal of chromatography 2016 v.1437 pp. 37-48
ISSN:
0021-9673
Subject:
acetonitrile; detection limit; drugs; humans; liquid chromatography; metabolites; rivers; sediments; solid phase extraction; solvents; statistical analysis; tandem mass spectrometry
Abstract:
... An analytical method based on a modified Quick, Easy, Cheap, Effective, Rugged and Safe (QuEChERS) extraction procedure followed by ultra-high performance liquid chromatography–tandem mass spectrometry (UHPLC–MS/MS) was developed for the analysis of psychiatric drugs in sediments. An optimized approach was applied in sample preparation by using basic acetonitrile as extraction solvent. Extraction ...
DOI:
10.1016/j.chroma.2016.01.079

79. Development of high-throughput multi-residue method for non-steroidal anti-inflammatory drugs monitoring in swine muscle by LC-MS/MS

Author:
Ana Maria Bergold,   et al.   ; Tamara S. Castilhos; Fabiano Barreto; Leonardo Meneghini;     Show all 4 Authors
Source:
Food additives & contaminants 2016 v.33 no.7 pp. 1166-1174
ISSN:
1944-0057
Subject:
acetic acid; acetonitrile; ammonium acetate; evaporation; food availability; hexane; mass spectrometry; metabolites; monitoring; multiresidue analysis; muscles; nonsteroidal anti-inflammatory agents; spectrometers; swine
Abstract:
... A reliable and simple method for the detection and quantification of residues of 14 non-steroidal anti-inflammatory drugs and a metamizole metabolite in swine muscle was developed using liquid chromatography-electrospray ionisation-tandem mass spectrometry (LC-ESI-MS/MS). The samples were extracted with acetonitrile (ACN) in solid–liquid extraction followed by a low-temperature partitioning (LLE-L ...
DOI:
10.1080/19440049.2016.1198497

80. Enthalpic versus Entropic Contribution to the Quinone Formal Potential in a Polypyrrole-Based Conducting Redox Polymer

Author:
Strømme Maria,   et al.   ; Emanuelsson Rikard; Huang Hao; Gogoll Adolf; Sjödin Martin;     Show all 5 Authors
Source:
The Journal of Physical Chemistry C 2016 v.120 no.38 pp. 21178-21183
ISSN:
1932-7455
Subject:
acetonitrile; aqueous solutions; electric power; electrochemistry; electrolytes; hydroquinone; pH; physical chemistry; polymers; pyridines
Abstract:
... A conducting redox polymer (CPR) based on pyrrole with a hydroquinone pendant group was synthesized through electropolymerization of the corresponding monomer. The formal potential (E⁰′) in aqueous solution at different pH as well as in MeCN containing equal amounts of pyridinium-triflates and the corresponding free pyridine with different pKₐ was investigated. E⁰′ could be completely recovered in ...
DOI:
10.1021/acs.jpcc.6b05353

81. Fast analysis of curcuminoids from turmeric (Curcuma longa L.) by high-performance liquid chromatography using a fused-core column

Author:
Maria Angela de Almeida Meireles,   et al.   ; J. Felipe Osorio-Tobón; Pedro I.N. Carvalho; Gerardo Fernández Barbero; Gislaine Chrystina Nogueira; Mauricio Ariel Rostagno;     Show all 6 Authors
Source:
Food chemistry 2016 v.200 pp. 167-174
ISSN:
0308-8146
Subject:
Curcuma longa; acetonitrile; curcumin; detection limit; ethanol; high performance liquid chromatography; methanol; rhizomes; solvents; temperature; turmeric
Abstract:
... The recent development of fused-core technology in HPLC columns is enabling faster and highly efficient separations. This technology was evaluated for the development of a fast method for the analysis of main curcuminoids (curcumin, demethoxycurcumin and bisdemethoxycurcumin) present in extracts of turmeric (Curcuma longa L.). A step-by-step strategy was used to optimize temperature (40–55°C), flo ...
DOI:
10.1016/j.foodchem.2016.01.021

82. Improved immobilization and stabilization of lipase from Rhizomucor miehei on octyl-glyoxyl agarose beads by using CaCl2

Author:
Maria D. Rodriguez,   et al.   ; Laura Fernandez-Lopez; Nazzoly Rueda; Rocio Bartolome-Cabrero; Tiago L. Albuquerque; Jose C.S. dos Santos; Oveimar Barbosa; Roberto Fernandez-Lafuente;     Show all 8 Authors
Source:
Process biochemistry 2016 v.51 no.1 pp. 48-52
ISSN:
1359-5113
Subject:
Rhizomucor miehei; acetonitrile; agarose; buffers; calcium; calcium chloride; carboxylic ester hydrolases; manganese chloride; pH; screening
Abstract:
... A strategy to stabilize octyl (OC)-Rhizomucor miehei lipase (RML) and OC-Candida rugosa lipase (CRL) at pH 10 is necessary to take full advantage of the immobilization of these enzymes on OC-glyoxyl (OCGLX) supports. CaCl2 and MnCl2 have been reported to stabilize OC-RM and OC-CRL at pH 5.0 and 7.0. After screening different buffers, 5mM CaCl2 was found to be fully soluble in Gly at pH 10. OC-RML ...
DOI:
10.1016/j.procbio.2015.11.015

83. In house validation from direct determination of 5-hydroxymethyl-2-furfural (HMF) in Brazilian corn and cane syrups samples by HPLC–UV

Author:
Maria L. Felsner,   et al.   ; Jucimara K. de Andrade; Emy Komatsu; Hélène Perreault; Yohandra R. Torres; Marcos R. da Rosa;     Show all 6 Authors
Source:
Food chemistry 2016 v.190 pp. 481-486
ISSN:
0308-8146
Subject:
acetonitrile; cane syrup; corn; corn syrup; food safety; formic acid; high performance liquid chromatography; hydroxymethylfurfural
Abstract:
... In this work the development and in house validation of the HMF direct determination in corn and cane syrups by HPLC–UV was carried out for the first time. The separation was done with isocratic elution of a mobile phase comprising water (with 0.5% formic acid) and acetonitrile (90:10, v/v) on Phenomenex C18 column (5.0μm, 4.6×150mm), at 30°C, flow rate of 0.8mLmin−1 and detection at 285nm. The va ...
DOI:
10.1016/j.foodchem.2015.05.131

84. Intramolecular oxidative palladium-catalyzed diamination reactions of alkenyl sulfamates: an efficient synthesis of [1,2,5]thiadiazolo-fused piperazinones

Author:
Maria A. Chiacchio,   et al.   ; Ugo Chiacchio; Gianluigi Broggini; Roberto Romeo; Silvia Gazzola; Salvatore V. Giofrè; Bartolo Gabriele; Raffaella Mancuso; Giuseppe Floresta; Chiara Zagni;     Show all 10 Authors
Source:
RSC advances 2016 v.6 no.62 pp. 57521-57529
ISSN:
2046-2069
Subject:
acetonitrile; amination; catalytic activity; palladium; sulfamates
Abstract:
... A palladium-catalyzed diamination domino process of sulfamates arising from glycine allylamides is reported. The reaction leads to the formation of [1,2,5]thiadiazolo-fused piperazinones. The essential feature of the synthetic route is the use of PdCl₂(MeCN)₂/CuBr₂, as a catalytic system which promotes the second amination process, leading to the bicycle ring-fused compounds in good yields. ...
DOI:
10.1039/c6ra13141g

85. Investigations into the separation behaviour of perfluorinated C8 and undecanoic acid modified silica hydride stationary phases

Author:
Maria T. Matyska,   et al.   ; Chadin Kulsing; Yuanzhong Yang; Roshanak Sepehrifar; Michael Lim; Joshua Toppete; Joseph J. Pesek; Reinhard I. Boysen; Milton T.W. Hearn;     Show all 9 Authors
Source:
Analytica chimica acta 2016 v.916 pp. 102-111
ISSN:
0003-2670
Subject:
acetonitrile; analytical chemistry; energy; hydrides; pH; silica; solvents; zeta potential
Abstract:
... In this study, the surface charge properties of perfluorinated C8 (PerfluoroC8) and undecanoic acid (UDA) modified silica hydride stationary phases have been investigated. The zeta potential values of these stationary phases were measured in aqueous/acetonitrile mobile phases of different pH, buffer concentrations and acetonitrile contents. The retention behaviour of several basic, acidic and neut ...
DOI:
10.1016/j.aca.2016.02.013

86. Ion-molecule adduct formation in tandem mass spectrometry

Author:
Maria Teresa Galceran,   et al.   ; Élida Alechaga; Encarnación Moyano;     Show all 3 Authors
Source:
Analytical and bioanalytical chemistry 2016 v.408 no.4 pp. 1269-1277
ISSN:
1618-2642
Subject:
acetonitrile; drugs; gases; heterocyclic amines; ionization; ions; levamisole; methanol; monitoring; solvents; spectrometers; tandem mass spectrometry
Abstract:
... Nowadays most LC-MS methods rely on tandem mass spectrometry not only for quantitation and confirmation of compounds by multiple reaction monitoring (MRM), but also for the identification of unknowns from their product ion spectra. However, gas-phase reactions between charged and neutral species inside the mass analyzer can occur, yielding product ions at m/z values higher than that of the precurs ...
DOI:
10.1007/s00216-015-9237-6

87. Ionic Liquid-Induced Local Charge Compensation: Effects on Back Electron-Transfer Rates in Dye-Sensitized TiO2 Thin Films

Author:
Abrahamsson Maria,   et al.   ; Saavedra Becerril Valeria; Franchi Daniele;     Show all 3 Authors
Source:
The Journal of Physical Chemistry C 2016 v.120 no.36 pp. 20016-20023
ISSN:
1932-7455
Subject:
absorption; acetonitrile; cations; dyes; electron transfer; electrons; ionic liquids; ligands; oxidation; photovoltaic cells; thiocyanates; titanium dioxide
Abstract:
... The effect of ionic liquid electrolytes on back electron-transfer rates for dye-sensitized TiO₂ thin films was investigated using microsecond–millisecond transient absorption. For D35/TiO₂ and [Ru(dcb)₃]²⁺/TiO₂ in electrolytes based on 1-alkyl-3-methyl-imidazolium hexafluorophosphate, significantly slower back electron-transfer rates, compared to those observed in neat acetonitrile (CH₃CN) and LiC ...
DOI:
10.1021/acs.jpcc.6b06088

88. Molecularly imprinted pipette-tip solid phase extraction for selective determination of fluoroquinolones in human urine using HPLC-DAD

Author:
Anny Talita Maria da Silva,   et al.   ; Hanna Leijoto de Oliveira; Sara da Silva Anacleto; Arnaldo César Pereira; Warley de Souza Borges; Eduardo Costa Figueiredo; Keyller Bastos Borges;     Show all 7 Authors
Source:
Journal of chromatography 2016 v.1033-1034 pp. 27-39
ISSN:
1570-0232
Subject:
acetonitrile; ciprofloxacin; excretion; high performance liquid chromatography; humans; ionic strength; molecular imprinting; norfloxacin; pH; phosphoric acid; polymers; solid phase extraction; solvents; triethylamine; urine; washing
Abstract:
... A simple method using HPLC-DAD was developed for the determination of fluoroquinolones in human urine including ciprofloxacin (CIPRO), enrofloxacino (ENRO), marbofloxacino (MARBO) and norfloxacin (NOR). In addition, it was studied the extraction of fluoroquinolones in human urine samples using pipette tip-based molecularly imprinted polymers solid phase extraction (PT-MIPs-SPE). With the goal of f ...
DOI:
10.1016/j.jchromb.2016.08.008

89. Optimization and development of a high‐performance liquid chromatography method for the simultaneous determination of vitamin E and carotenoids in tomato fruits

Author:
Maria Irakli,   et al.   ; Paschalina Chatzopoulou; Kalliopi Kadoglidou; Nektaria Tsivelika;     Show all 4 Authors
Source:
Journal of separation science 2016 v.39 no.17 pp. 3348-3356
ISSN:
1615-9306
Subject:
acetonitrile; antioxidants; beta-carotene; cherries; detection limit; detectors; ethyl acetate; fluorescence; fruits; hexane; high performance liquid chromatography; lutein; lycopene; methanol; methylene chloride; phytopharmaceuticals; pulp; solid phase extraction; solvents; tocopherols; tocotrienols; tomatoes; zeaxanthin
Abstract:
... A simple and reliable high‐performance liquid chromatography method was developed and validated for the simultaneous determination of lipophilic antioxidants in tomato fruits using C₃₀ column operated at 15°C and a gradient mobile phase based on acetonitrile/methanol/dichloromethane in a total run time of 30 min. Diode array and fluorescence detectors were used respectively for the detection of ca ...
DOI:
10.1002/jssc.201600491

90. Optimized and validated high‐performance liquid chromatography method for the determination of deoxynivalenol and aflatoxins in cereals

Author:
Maria N. Irakli; Maria D. Papageorgiou,   et al.   ; Adriana Skendi;     Show all 3 Author
Source:
Journal of separation science 2016 v.39 no.8 pp. 1425-1432
ISSN:
1615-9306
Subject:
acetonitrile; aflatoxins; corn; deoxynivalenol; fluorescence; high performance liquid chromatography; humans; methanol; response surface methodology; solid phase extraction; Greece
Abstract:
... A simple, sensitive and accurate analytical method was optimized and developed for the determination of deoxynivalenol and aflatoxins in cereals intended for human consumption using high‐performance liquid chromatography with diode array and fluorescence detection and a photochemical reactor for enhanced detection. A response surface methodology, using a fractional central composite design, was ca ...
DOI:
10.1002/jssc.201501217

91. Photoinduced Energy and Electron-Transfer Reactions by Polypyridine Ruthenium(II) Complexes Containing a Derivatized Perylene Diimide

Author:
Carlos Rose Maria,   et al.   ; Santos Edjane R. dos; Pina João; Venâncio Tiago; Serpa Carlos; Martinho José M. G.;     Show all 6 Authors
Source:
The Journal of Physical Chemistry C 2016 v.120 no.40 pp. 22831-22843
ISSN:
1932-7455
Subject:
absorption; acetonitrile; catalytic activity; color; electron transfer; electrons; energy; ligands; moieties; oxygen; paraquat; photolysis; ruthenium; singlet oxygen; spectroscopy; triethylamine
Abstract:
... The [Ru(II) (phen)₂(pPDIp)]²⁺ complex, where pPDIp is the symmetric bridging ligand phenanthroline–perylene–phenanthroline, shows strong electronic absorption bands attributed to the pPDIp and {Ru(phen)₂}²⁺ moieties in acetonitrile. The charge-separated intermediate {Ru(III) (phen)₂(pPDIp–•)} was detected by transient absorption spectroscopy upon electronic excitation in either the pPDIp or the co ...
DOI:
10.1021/acs.jpcc.6b06693

92. Selective recovery of acidic and lactonic sophorolipids from culture broths towards the improvement of their therapeutic potential

Author:
Maria H. L. Ribeiro,   et al.   ; Isabel A. C. Ribeiro; M. Rosário Bronze; Matilde F. Castro;     Show all 4 Authors
Source:
Bioprocess and biosystems engineering 2016 v.39 no.12 pp. 1825-1837
ISSN:
1615-7591
Subject:
Starmerella bombicola; acetone; acetonitrile; adsorbents; antineoplastic activity; aqueous solutions; culture media; cytokines; desorption; ethanol; methanol; solvents; sophorolipids; temperature
Abstract:
... Sophorolipids (SLs) were produced by Starmerella bombicola. The separation and purification of SLs are a complex process, since they are produced as a mixture of compounds with few structural differences. Solvent extraction is commonly used in downstream processing. In this work, an environmental friendly approach was developed for SLs recovery and purification, based on neutral polymeric sorbents ...
DOI:
10.1007/s00449-016-1657-y

93. Simultaneous quantification of 11 cannabinoids and metabolites in human urine by liquid chromatography tandem mass spectrometry using WAX-S tips

Author:
Maria Andersson,   et al.   ; Karl B. Scheidweiler; Cristina Sempio; Allan J. Barnes; Marilyn A. Huestis;     Show all 5 Authors
Source:
Analytical and bioanalytical chemistry 2016 v.408 no.23 pp. 6461-6471
ISSN:
1618-2642
Subject:
acetonitrile; ammonium acetate; cannabidiol; drugs; forensic sciences; guidelines; humans; ionization; liquid chromatography; metabolites; methanol; monitoring; tandem mass spectrometry; toxicology; urine
Abstract:
... A comprehensive cannabinoid urine quantification method may improve clinical and forensic result interpretation and is necessary to support our clinical research. A liquid chromatography tandem mass spectrometry quantification method for ∆⁹-tetrahydrocannabinol (THC), 11-hydroxy-THC (11-OH-THC), 11-nor-9-carboxy-THC (THCCOOH), ∆⁹-tetrahydrocannabinolic acid (THCAA), cannabinol (CBN), cannabidiol ( ...
DOI:
10.1007/s00216-016-9765-8
PubMed:
27422645
PubMed Central:
PMC5010516

94. Solvation processes on phenyl‐bonded stationary phases—The influence of polar functional groups

Author:
Maria Matyska,   et al.   ; Szymon Bocian; Magdalena Skoczylas; Izabela Goryńska; Joseph Pesek; Bogusław Buszewski;     Show all 6 Authors
Source:
Journal of separation science 2016 v.39 no.22 pp. 4369-4376
ISSN:
1615-9306
Subject:
acetonitrile; adsorption; hydrophobicity; methanol; moieties; phase transition; solvents
Abstract:
... A series of phenyl‐bonded stationary phases with incorporated polar functional groups was subjected to an adsorption investigation. Measurement of acetonitrile and methanol adsorption was obtained using the minor disturbance method. It was observed that adsorption of organic solvent strongly depends on the presence of polar functional groups in the bonded phases that influence the hydrophobicity a ...
DOI:
10.1002/jssc.201600799

95. 3-MeO-PCP intoxication in two young men: First in vivo detection in Italy

Author:
Maria Grazia Di Milia,   et al.   ; Elisabetta Bertol; Jennifer Pascali; Diego Palumbo; Valeria Catalani; Alessia Fioravanti; Francesco Mari; Fabio Vaiano;     Show all 8 Authors
Source:
Forensic science international 2017 v.274 pp. 7-12
ISSN:
0379-0738
Subject:
acetonitrile; acidosis; alcohol drinking; anesthetics; blood; forensic sciences; gas chromatography-mass spectrometry; hospitals; hypothermia; liquid chromatography; men; methanol; monitoring; pharmacology; poisoning; psychotropic agents; screening; sedatives; tandem mass spectrometry; toxicity; toxicology; urine; Italy
Abstract:
... 3-MeO-PCP or 3-methoxyphencyclidine is a derivative of phencyclidine. It acts as a dissociative anesthetic and it has allegedly hallucinogenic and sedative effects. There are almost no documented intoxication cases and references about its pharmacology and toxicity in literature. This study presents two concomitant intoxication cases due to consumption of 3-MeO-PCP and alcohol. A 19 (A) and a 21 y ...
DOI:
10.1016/j.forsciint.2016.12.028

96. A validated UPLC-MS/MS multi-mycotoxin method for nuts and cereals: results of the official control in Cyprus within the EU requirements

Author:
Maria Christofidou,   et al.   ; Demetris Kafouris; Markela Christodoulou; Eftychia Christou; Eleni Ioannou-Kakouri;     Show all 5 Authors
Source:
Food and agricultural immunology 2017 v.28 no.1 pp. 90-108
ISSN:
1465-3443
Subject:
European Union; HT-2 toxin; acetonitrile; aflatoxins; deoxynivalenol; detection limit; fumonisins; grains; laws and regulations; monitoring; nuts; ochratoxin A; tandem mass spectrometry; ultra-performance liquid chromatography; zearalenone; Cyprus
Abstract:
... The validation of a rapid, reliable and sensitive method for the simultaneous determination of Aflatoxins, Ochratoxin A, Zearalenone, Deoxynivalenol, Fumonisins, T-2 and HT-2 toxins, in nuts and cereals is reported. This method is based on a single extraction step using an acetonitrile/water mixture followed by the analysis of the diluted crude extract using ultra high-performance liquid chromatog ...
DOI:
10.1080/09540105.2016.1228834

97. Accelerated solvent extraction by using an ‘in-line’ clean-up approach for multiresidue analysis of pesticides in organic honey

Author:
Luca Maria Chiesa,   et al.   ; Giuseppe Federico Labella; Sara Panseri; Domenico Britti; Fabrizio Galbiati; Roberto Villa; Francesco Arioli;     Show all 7 Authors
Source:
Food additives & contaminants 2017 v.34 no.5 pp. 809-818
ISSN:
1944-0057
Subject:
European Union; acetonitrile; guidelines; honey; honey bee colonies; mass spectrometry; multiresidue analysis; pesticide residues; pesticides; solvents
Abstract:
... The worldwide loss of honeybee colonies may be due to their exposure to several contaminants (i.e., pesticides); such contamination may also have impacts on consumers’ health. Therefore, it is essential to develop quick and new methods to detect several pesticide residues in honey samples. In this study, the effectiveness of accelerated solvent extraction (ASE) was compared with QuEChERS methods f ...
DOI:
10.1080/19440049.2017.1292558

98. Behavior of detoxifying enzymes of Aedes aegypti exposed to girgensohnine alkaloid analog and Cymbopogon flexuosus essential oil

Author:
Angela Maria Palacio-Cortés,   et al.   ; Aurora L. Carreño Otero; Mario Antonio Navarro-Silva; Vladimir V. Kouznetsov; Jonny E. Duque L.;     Show all 5 Authors
Source:
Comparative Biochemistry and Physiology, Part C 2017 pp. -
ISSN:
1532-0456
Subject:
Aedes aegypti; Cymbopogon flexuosus; acetonitrile; acetylcholinesterase; adults; alkaloids; enzyme activity; essential oils; glutathione transferase; insecticides; larvae; mosquito control; Colombia
Abstract:
... Because mosquito control depend on the use of commercial insecticides and resistance has been described in some of them, there is a need to explore new molecules no resistant. In vivo effects of girgensohnine analog 2-(3,4-dimethoxyphenyl)-2-(piperidin-1-yl)acetonitrile DPPA and Cymbopogon flexuosus essential oil CFEO, on the detoxifying enzymes acetylcholinesterase (AChE), glutathione-S-transfera ...
DOI:
10.1016/j.cbpc.2017.11.002

99. Determination of Mycotoxins in Cereal-Based Porridge Destined for Infant Consumption by Ultra-High Performance Liquid Chromatography-Tandem Mass Spectrometry

Author:
Maria Heloísa Paulino de Moraes,   et al.   ; André Victor Sartori; Rosana Pereira dos Santos; Yuri Pereira Souza; Armi Wanderley da Nóbrega;     Show all 5 Authors
Source:
Food analytical methods 2017 v.10 no.12 pp. 4049-4061
ISSN:
1936-9751
Subject:
acetonitrile; aflatoxins; deoxynivalenol; formic acid; fumonisins; laws and regulations; liquid chromatography; ochratoxin A; solvents; sonication; statistical analysis; sterigmatocystin; tandem mass spectrometry; zearalenone; Brazil
Abstract:
... An analytical method applying ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) for the determination of aflatoxins M2, M1, G2, G1, B2, B1, deoxynivalenol, ochratoxin A, fumonisins B1 and B2, hydrolyzed fumonisins B1 and B2, zearalenone and sterigmatocystin in cereal-based porridge destined for infant consumption was developed and validated. The mycotoxins were ex ...
DOI:
10.1007/s12161-017-0965-4

100. Development and validation of HPLC–MS/MS procedure for determination of 3,4,4′,5-tetra-methoxystilbene (DMU-212) and its metabolites in ovarian cancer cells and culture medium

Author:
Anna Maria Sulej-Suchomska,   et al.   ; Agnieszka Klupczynska; Hanna Piotrowska-Kempisty; Marcin Wierzchowski; Jadwiga Jodynis-Liebert; Zenon J. Kokot;     Show all 6 Authors
Source:
Journal of chromatography 2017 v.1060 pp. 30-35
ISSN:
1570-0232
Subject:
acetonitrile; ammonium acetate; animal ovaries; antineoplastic activity; culture media; formic acid; high performance liquid chromatography; humans; metabolites; monitoring; neoplasm cells; ovarian neoplasms; resveratrol; solvents; spectrometers
Abstract:
... The synthetic resveratrol analogue DMU-212 (3,4,4′,5-tetramethoxystilbene) has been shown to possess stronger anticancer activity than resveratrol in a variety of tumour cells. To date, there has been no appropriate procedure that would ensure a reliable data about levels of metabolic products of DMU-212 in cancer cell lines. The purpose of this study was to develop a new procedure for determinati ...
DOI:
10.1016/j.jchromb.2017.05.015