PubAg

Main content area

You searched for: Journal Analytica chimica acta Remove constraint Journal: Analytica chimica acta Text Availability Citation in PubAg Remove constraint Text Availability: Citation in PubAg
Start Over

Search

4,645  Search Results

« Previous | 1 - 20 of 4,645 |
Number of results to display per page

Search Results

1. Modified 3D-printed device for mercury determination in waters

Author:
Mattio, Elodie; Ollivier, Nadia; Robert-Peillard, Fabien; Di Rocco, Robert; Branger, Catherine; Margaillan, André; Brach-Papa, Christophe; Knoery, Joël; Bonne, Damien; Boudenne, Jean-Luc; Coulomb, Bruno
Source:
Analytica chimica acta 2019 v.1082 pp. 78-85
ISSN:
0003-2670
Subject:
analytical chemistry; atomic absorption spectrometry; cysteine; dicarboxylic acids; gold; mercury; moieties
Abstract:
... 3D printing technology is increasingly used in flow analysis, to develop low cost and tailor-made devices. The possibility of grafting specific molecules onto 3D printed parts offers new perspectives for the development of flow systems. In this study, a MPFS system including a dicarboxylate 1,5-diphenyl-3-thiocarbazone grafted 3D-printed device has been developed for mercury determination. For thi ...
DOI:
10.1016/j.aca.2019.06.062

2. A paper-based length of stain analytical device for naked eye (readout-free) detection of cystic fibrosis

Author:
Taghizadeh-Behbahani, Maryam; Hemmateenejad, Bahram; Shamsipur, Mojtaba; Tavassoli, Alireza
Source:
Analytica chimica acta 2019 v.1080 pp. 138-145
ISSN:
0003-2670
Subject:
analytical chemistry; anions; cations; color; cystic fibrosis; electrochemistry; hydrophilicity; neonates; screening; sediments; silver; silver chloride; standard deviation; sweat
Abstract:
... The test of sweat chloride is routinely performed as a worldwide newborn screening (NBS) to the diagnosis of cystic fibrosis (CF) in infants. However, the available methods for measurement of chloride in sweat suffer from such limitations as either low selectivity and/or requiring relatively large sample size. In this work, we have designed an analytical ruler that can measure chloride ion in swea ...
DOI:
10.1016/j.aca.2019.06.050

3. A critical retrospective and prospective review of designs and materials in in-line solid-phase extraction capillary electrophoresis

Author:
Pont, L.; Pero-Gascon, R.; Gimenez, E.; Sanz-Nebot, V.; Benavente, F.
Source:
Analytica chimica acta 2019 v.1079 pp. 1-19
ISSN:
0003-2670
Subject:
analytical chemistry; capillary electrophoresis; detection limit; instrumentation; ligands; solid phase extraction; sorbents
Abstract:
... Several strategies have been developed to decrease the concentration limits of detection (LODs) in capillary electrophoresis (CE). Nowadays, chromatographic-based preconcentration using a microcartridge integrated in the separation capillary for in-line solid-phase extraction capillary electrophoresis (SPE-CE) is one of the best alternatives for high throughput and reproducible sample clean-up and ...
DOI:
10.1016/j.aca.2019.05.022

4. Influence of the acid-base ionization of drugs in their retention in reversed-phase liquid chromatography

Author:
Soriano-Meseguer, Sara; Fuguet, Elisabet; Port, Adriana; Rosés, Martí
Source:
Analytica chimica acta 2019 v.1078 pp. 200-211
ISSN:
0003-2670
Subject:
acids; algorithms; analytical chemistry; anions; cations; chemical bases; dielectric properties; dimethyl sulfoxide; drugs; equations; ionization; lipophilicity; models; pH; potassium bromide; reversed-phase high performance liquid chromatography; reversed-phase liquid chromatography
Abstract:
... The effect of the ionization in the RP-HPLC retention of 66 acid-base compounds, most of them drugs of pharmaceutical interest, is studied. The retention time of the compounds can be related to the pH measured in the mobile phase (pwsH) through the sigmoidal equations derived from distribution of the neutral and ionic forms of the drug into the stationary and mobile phases. Fitting of the obtained ...
DOI:
10.1016/j.aca.2019.05.063

5. Critical review of electronic nose and tongue instruments prospects in pharmaceutical analysis

Author:
Wasilewski, Tomasz; Migoń, Dorian; Gębicki, Jacek; Kamysz, Wojciech
Source:
Analytica chimica acta 2019 v.1077 pp. 14-29
ISSN:
0003-2670
Subject:
analytical chemistry; electronic nose; electronic tongue; humans; monitoring; pharmaceutical industry; quality control; smell; taste; tongue
Abstract:
... Electronic nose (enose, EN) and electronic tongue (etongue, ET) have been designed to simulate human senses of smell and taste in the best possible way. The signals acquired from a sensor array, combined with suitable data analysis system, are the basis for holistic analysis of samples. The efficiency of these instruments, regarding classification, discrimination, detection, monitoring and analyti ...
DOI:
10.1016/j.aca.2019.05.024

6. Simplification of organic matter before voltammetric determination of Tl(I) and Tl(III) in water using nanostructured photocatalyst and solar light

Author:
Biaduń, Ewa; Miecznikowski, Krzysztof; Sadowska, Monika; Kużelewska, Alicja; Drwal, Krzysztof; Krasnodębska-Ostręga, Beata
Source:
Analytica chimica acta 2019 v.1076 pp. 48-54
ISSN:
0003-2670
Subject:
analytical chemistry; ions; iron; irradiation; organic matter; oxidation; pH; photocatalysts; photolysis; river water; solar radiation; surfactants; thallium
Abstract:
... The crucial point of this study was to verify the hypothesis that both thallium species are not affected by the procedure of photolysis when it is applied as a method of simplification of sample matrix containing surfactants, and that this method of sample pretreatment leads to reliable results of Tl speciation analysis. It is important especially because of high instability of Tl(III), which make ...
DOI:
10.1016/j.aca.2019.05.033

7. Heterogeneity analysis of polymeric carboxylic acid functionality by selective derivatization followed by size exclusion chromatography

Author:
Brooijmans, T.; Okhuijsen, R.A.; Oerlemans, G.M.M.; Pirok, B.W.J.; Schoenmakers, P.J.; Peters, R.A.H.
Source:
Analytica chimica acta 2019 v.1072 pp. 87-94
ISSN:
0003-2670
Subject:
analytical chemistry; carboxylic acids; coatings; derivatization; dispersions; environmental impact; gel chromatography; molecular weight; polymers; quantitative analysis; refractive index; spectroscopy
Abstract:
... Waterborne polymers are increasingly applied in our society, replacing traditional solvent-borne coatings and thus reducing environmental impact of coatings. The majority of waterborne dispersions are stabilized by the incorporation of neutralizable carboxylic acid functionality. The characterization of synthetic waterborne polymer systems can be performed by a wide variety of chromatographic and ...
DOI:
10.1016/j.aca.2019.04.051

8. Self-heated Ag-decorated SnO2 nanowires with low power consumption used as a predictive virtual multisensor for H2S-selective sensing

Author:
Ngoc, Trinh Minh; Van Duy, Nguyen; Hung, Chu Manh; Hoa, Nguyen Duc; Nguyen, Hugo; Tonezzer, Matteo; Van Hieu, Nguyen
Source:
Analytica chimica acta 2019 v.1069 pp. 108-116
ISSN:
0003-2670
Subject:
Internet; ammonia; analytical chemistry; energy use and consumption; ethanol; gases; hydrogen; hydrogen sulfide; nanowires; silver; tin dioxide
Abstract:
... Multisensor systems with low-power consumption are emerging for the Internet of Things. In this work, we demonstrate the use of self-heated networked Ag-decorated SnO2 NW sensors integrated into a portable module for selective detection of H2S gas at low power consumption, and the integrated system is simulated as a virtual multisensor under varying heating powers for identifying and quantifying d ...
DOI:
10.1016/j.aca.2019.04.020

9. Impact of sample dimensionality on orthogonality metrics in comprehensive two-dimensional separations

Author:
Jáčová, Jaroslava; Gardlo, Alžběta; Dimandja, Jean-Marie D.; Adam, Tomáš; Friedecký, David
Source:
Analytica chimica acta 2019 v.1064 pp. 138-149
ISSN:
0003-2670
Subject:
algorithms; analytical chemistry; arithmetics; entropy; equations; geometry; urine
Abstract:
... Orthogonality is a key parameter in the evaluation of the performance of a 2D chromatography-based separation system. Two different perspectives on orthogonality are determined: the extent of the separation space utilized (global orthogonality) and the uniformity of the coverage of the separation space (local orthogonality). This work aims to elucidate the impact of sample dimensionality (the numb ...
DOI:
10.1016/j.aca.2019.03.018

10. Development of a portable setup using a miniaturized and high precision colorimeter for the estimation of phosphate in natural water

Author:
Yan, Jun-Chao; Ren, Jun; Ren, Lin-Lin; Jian, Jin-Ming; Yang, Yi; Yang, Si-Fan; Ren, Tian-Ling
Source:
Analytica chimica acta 2019 v.1058 pp. 70-79
ISSN:
0003-2670
Subject:
algorithms; ambient temperature; ammonium; analytical chemistry; ascorbic acid; colorimetry; detection limit; energy; liquids; molybdates; organ-on-a-chip; phosphates; spectrophotometers
Abstract:
... In this work, a high integrated water detection system comprised a miniaturized and high precision homemade colorimeter, a microfluidic analysis module and a wireless module was reported. A reagent reaction based on the ammonium molybdate spectrophotometric method was recorded for the estimation of phosphate in natural water. A laser self-modulating module of 880 nm was used as the radiation sourc ...
DOI:
10.1016/j.aca.2019.01.030

11. Analysis of charged acrylic particles by on-line comprehensive two-dimensional liquid chromatography and automated data-processing

Author:
Pirok, Bob W.J.; Abdulhussain, Noor; Brooijmans, Ton; Nabuurs, Tijs; de Bont, Jens; Schellekens, Mike A.J.; Peters, Ron A.H.; Schoenmakers, Peter J.
Source:
Analytica chimica acta 2019 v.1054 pp. 184-192
ISSN:
0003-2670
Subject:
algorithms; analytical chemistry; automation; comprehensive two-dimensional liquid chromatography; dispersions; emulsions; filters; gel chromatography; hydrodynamics; hydrophilicity; hydrophobicity; moieties; molecular weight; nanoparticles; particle size; polymerization; polymers
Abstract:
... A thorough understanding of particle formation and polymer growth during emulsion polymerization is indispensable for the development of particles and products with very specific properties. This has created a demand for the detailed characterization of various properties and property distributions – and the relation between these. A method is described that enables comprehensive, simultaneous det ...
DOI:
10.1016/j.aca.2018.12.059

12. On-line microfluidic immobilized-enzyme reactors: A new tool for characterizing synthetic polymers

Author:
Wouters, Bert; Pirok, Bob W.J.; Soulis, Dionysios; Garmendia Perticarini, Rocío C.; Fokker, Sander; van den Hurk, Rick S.; Skolimowski, Maciej; Peters, Ron A.H.; Schoenmakers, Peter J.
Source:
Analytica chimica acta 2019 v.1053 pp. 62-69
ISSN:
0003-2670
Subject:
analytical chemistry; biodegradability; chemical composition; comprehensive two-dimensional liquid chromatography; gel chromatography; nanoparticles; particle size; polymers; therapeutics; tissue engineering
Abstract:
... Biodegradable polymeric materials may eventually replace biostable materials for medical applications, including therapeutic devices, scaffolds for tissue engineering, and drug-delivery vehicles. To further develop such materials, a more fundamental understanding is necessary to correlate parameters including chemical-composition distribution within a macromolecular structure with the final proper ...
DOI:
10.1016/j.aca.2018.12.002

13. Photochemical multivariate curve resolution models for the investigation of photochromic systems under continuous irradiation

Author:
Devos, O.; Schröder, H.; Sliwa, M.; Placial, J.P.; Neymeyr, K.; Métivier, R.; Ruckebusch, C.
Source:
Analytica chimica acta 2019 v.1053 pp. 32-42
ISSN:
0003-2670
Subject:
analytical chemistry; irradiation; least squares; models; photochemistry; ultraviolet radiation; ultraviolet-visible spectroscopy; wavelengths
Abstract:
... We propose a multivariate curve resolution approach for the investigation of photochromic systems using UV-Visible spectroscopy. The incorporation of photochemical hard-models as constraints in multivariate curve resolution alternating least squares (MCR-ALS) allows extracting reaction quantum yields in situations where a complete knowledge of the system is not available. We apply this approach to ...
DOI:
10.1016/j.aca.2018.12.004

14. Effects of extraction method and storage of dry tissue on marine lipids and fatty acids

Author:
Sardenne, Fany; Bodin, Nathalie; Metral, Luisa; Crottier, Anaïs; Le Grand, Fabienne; Bideau, Antoine; Brisset, Blandine; Bourjea, Jérôme; Saraux, Claire; Bonhommeau, Sylvain; Kerzérho, Vincent; Bernard, Serge; Rouyer, Tristan
Source:
Analytica chimica acta 2019 v.1051 pp. 82-93
ISSN:
0003-2670
Subject:
Crustacea; analytical chemistry; analytical methods; fatty acids; fish; freezers; lipid content; molluscs; nitrogen; protocols; solvents; tissues
Abstract:
... Various protocols are currently used to study marine lipids, but there is a growing interest in working on dry samples that are easier to transport. However, reference protocols are still lacking for dry samples. In order to make recommendations on this use, lipid classes and fatty acids (FA) obtained from six analytical protocols using two different tissue states (dry vs wet) and three extraction ...
DOI:
10.1016/j.aca.2018.11.012

15. Identification of very long-chain (>C24) fatty acid methyl esters using gas chromatography coupled to quadrupole/time-of-flight mass spectrometry with atmospheric pressure chemical ionization source

Author:
Garlito, B.; Portolés, T.; Niessen, W.M.A.; Navarro, J.C.; Hontoria, F.; Monroig, Ó.; Varó, I.; Serrano, R.
Source:
Analytica chimica acta 2019 v.1051 pp. 103-109
ISSN:
0003-2670
Subject:
analytical chemistry; atmospheric pressure; chemical bonding; eyes; fatty acid methyl esters; fish; gas chromatography; heterologous gene expression; ionization; long chain polyunsaturated fatty acids; mass spectrometry; polyunsaturated fatty acids; reference standards; screening
Abstract:
... Gas chromatography coupled to a quadrupole time-of-flight mass analyzer (QTOF) with an atmospheric pressure chemical ionization (APCI) source has been tested to study the ionization and mass spectrometric behavior of long-chain and very long-chain polyunsaturated fatty acids (LC-PUFAs, C18–24; VLC-PUFAs, >C24). The protonated molecule ([M+H]+), measured at accurate mass, became the base peak of th ...
DOI:
10.1016/j.aca.2018.11.001

16. Dual redox labeling of DNA as a tool for electrochemical detection of p53 protein-DNA interactions

Author:
Hermanová, Monika; Orság, Petr; Balintová, Jana; Hocek, Michal; Fojta, Miroslav
Source:
Analytica chimica acta 2019 v.1050 pp. 123-131
ISSN:
0003-2670
Subject:
DNA; DNA probes; DNA-binding proteins; analytical chemistry; binding properties; binding sites; electrochemistry; magnetism; monoclonal antibodies; nitrobenzenes; precipitin tests
Abstract:
... We present a novel dual redox labeling approach enabling a facile relative evaluation of protein-DNA interactions based on immunoprecipitation at magnetic beads (MBIP) with subsequent electrochemical detection. DNA probes labeled with two different electroactive markers, benzofurazane and nitrobenzene, which yield reduction peaks at distinct potentials, were synthesized using primer extension (PEX ...
DOI:
10.1016/j.aca.2018.10.053

17. Comparison of simple monophasic versus classical biphasic extraction protocols for comprehensive UHPLC-MS/MS lipidomic analysis of Hela cells

Author:
Calderón, Carlos; Sanwald, Corinna; Schlotterbeck, Jörg; Drotleff, Bernhard; Lämmerhofer, Michael
Source:
Analytica chimica acta 2019 v.1048 pp. 66-74
ISSN:
0003-2670
Subject:
analytical chemistry; computer software; glass; human cell lines; isotope labeling; lipids; liquid chromatography; tandem mass spectrometry
Abstract:
... In this study, two monophasic isopropanol-water mixtures (IPA:H2O 75:25 v/v and IPA:H2O 90:10 v/v) were compared with traditionally employed biphasic methods of Bligh & Dyer and Matyash et al. as extraction systems for lipidomics analysis in Hela cells. Samples were analyzed by UHPLC-ESI-QTOF-MS/MS in positive and negative mode using sequential window acquisition of all theoretical fragment ion sp ...
DOI:
10.1016/j.aca.2018.10.035

18. Screening method for simultaneous detection of elaidic and vaccenic trans fatty acid isomers by capillary zone electrophoresis

Author:
Amorim, Tatiane Lima; Duarte, Lucas Mattos; Dos Santos, Hélio F.; de Oliveira, Marcone Augusto Leal
Source:
Analytica chimica acta 2019 v.1048 pp. 212-220
ISSN:
0003-2670
Subject:
acetonitrile; adulterated products; analytical chemistry; buffers; capillary zone electrophoresis; cheeses; cyclodextrins; electrolytes; isomers; methanol; saponification; screening; trans fatty acids; vaccenic acid
Abstract:
... A novel screening method for the simultaneous detection of elaidic and vaccenic trans fatty acid isomers by CZE-UV was proposed and applied to brazilian spreadable cheese analysis. Optimized background electrolyte was composed by 10 mmol L−1 heptakis (2, 3, 6-tri-o-methyl)-beta cyclodextrin, 24 mmol L−1 sodium tetraborate buffer solution, 45% methanol and 15% acetonitrile. Sample preparation compr ...
DOI:
10.1016/j.aca.2018.10.057

19. Stabilization and isotachophoresis of unmodified gold nanoparticles in capillary electrophoresis

Author:
Dziomba, Szymon; Ciura, Krzesimir; Correia, Bruna; Wielgomas, Bartosz
Source:
Analytica chimica acta 2019 v.1047 pp. 248-256
ISSN:
0003-2670
Subject:
adsorption; analytical chemistry; capillary zone electrophoresis; citrates; nanogold; zwitterions
Abstract:
... Capillary zone electrophoresis (CZE) of gold nanoparticles (Au NPs) was investigated in terms of dispersion stability during the analysis process. It was shown that CZE of Au NPs can be performed under dynamic coating conditions depending on the background electrolyte (BGE) composition. The influence of both the co-ion and counter-ion in the BGE was evaluated. It was proven that the application of ...
DOI:
10.1016/j.aca.2018.09.069

20. Acid-base properties of phosphoric and acetic acid in aprotic organic solvents – A complete thermodynamic characterisation

Author:
Barišić, D.; Tomišić, V.; Bregović, N.
Source:
Analytica chimica acta 2019 v.1046 pp. 77-92
ISSN:
0003-2670
Subject:
acetates; acetic acid; acetonitrile; analytical chemistry; anions; dimethyl sulfoxide; dimethylformamide; hydrogen bonding; phosphates; protonation; solvents; spectroscopy; stoichiometry; thermodynamics
Abstract:
... Knowledge regarding the acid-base behaviour in non-aqueous media has remained relatively scarce in spite of its importance for many aspects of chemistry. The research presented in this work fills some of particularly important gaps in the corresponding thermodynamic data.We report on a detailed study of acid-base properties of dihydrogen phosphate and acetate in aprotic organic solvents (acetonitr ...
DOI:
10.1016/j.aca.2018.09.026