U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

You searched for: marwa Remove constraint marwa Subject term acetonitrile Remove constraint Subject term: acetonitrile
Start Over

Search

12  Search Results

1 - 12 of 12
Number of results to display per page

Search Results

1. Elucidation of the Kinetic Behavior of Quercetin, Isoquercitrin, and Rutin Solubility by Physicochemical and Thermodynamic Investigations

Author:
Khaldi Marwa,   et al.   ; Chebil Latifa; Bouroukba Mohamed; Gaiani Claire; Charbonel Céline; Engasser Jean-Marc; Ghoul Mohamed;     Show all 7 Authors
Source:
Industrial & Engineering Chemistry Research 2013 v.52 no.4 pp. 1464-1470
ISSN:
1520-5045
Subject:
acetonitrile; biocatalysis; engineering; enthalpy; isoquercitrin; microscopy; mixing; particle size; quercetin; rutin; solubility
Abstract:
... The solubility of flavonoids in organic media is a complex and important process. It is a key factor in extraction, formulation, and biocatalysis processes of flavonoids. In this work, dissolution experiments showed that the solubility of quercetin, isoquercitrin, and rutin in tert-amyl alcohol is higher (20, 30, and 36 g/L) than in acetonitrile (1.7 g/L). Moreover, dissolution kinetic of querceti ...
DOI:
10.1021/ie3029202

2. Chromatographic determination of low-molecular mass unsaturated aliphatic aldehydes with peroxyoxalate chemiluminescence detection after fluorescence labeling with 4-(N,N-dimethylaminosulfonyl)-7-hydrazino-2,1,3-benzoxadiazole

Author:
Marwa Fathy Bakr Ali,   et al.   ; Naoya Kishikawa; Kaname Ohyama; Horria Abdel-Mageed Mohamed; Hanaa Mohamed Abdel-Wadood; Ashraf Mohamed Mahmoud; Takahiro Imazato; Yukitaka Ueki; Mitsuhiro Wada; Naotaka Kuroda;     Show all 10 Authors
Source:
Journal of Chromatography B 2014 v.953-954 pp. 147-152
ISSN:
1570-0232
Subject:
acetonitrile; acrolein; arthritis; blood serum; buffers; chemiluminescence; chromatography; detection limit; fluorescence; fluorescent labeling; humans; nitroprusside; oxidative stress; pH; patients
Abstract:
... A highly sensitive, selective and reproducible chromatographic method is described for determination of low-molecular mass unsaturated aliphatic aldehydes in human serum. The method combines fluorescent labeling using 4-(N,N-Dimethylaminosulfonyl)-7-hydrazino-2,1,3-benzoxadiazole with peroxyoxalate chemiluminescence. The derivatives were separated on a reversed-phase column C8 isocratically using ...
DOI:
10.1016/j.jchromb.2014.02.009

3. Novel liquid chromatographic methods for the determination of varenicline tartrate

Author:
Marwa A. El-Wahab Mohamed,   et al.   ; Ramzia I. El-Bagary; Nisreen F. Abo-Talib;     Show all 3 Authors
Source:
Talanta 2016 v.146 pp. 83-92
ISSN:
0039-9140
Subject:
fluorometry; potassium dihydrogen phosphate; derivatization; drugs; acetonitrile; pH; octane; sulfonic acids; diodes; liquid chromatography; quality control
Abstract:
... Two simple, sensitive, rapid, and stability-indicating liquid chromatographic (LC) methods have been developed for the determination of varenicline tartrate. They comprised the determination of varenicline (VRC) in the presence of its oxidative degradates and related impurity (N-formyl varenicline) (NFV). The first method was a LC with diode array detection (DAD) at 235nm using Ristek-Ultra® C18 c ...
DOI:
10.1016/j.talanta.2015.07.077

4. Stability indicating HPLC-DAD method for analysis of Ketorolac binary and ternary mixtures in eye drops: Quantitative analysis in rabbit aqueous humor

Author:
Marwa A.A. Ragab,   et al.   ; Fawzy A. El Yazbi; Ekram M. Hassan; Essam F. Khamis; Mohamed M.A. Hamdy;     Show all 5 Authors
Source:
Journal of chromatography 2017 v.1068-1069 pp. 218-225
ISSN:
1570-0232
Subject:
acetonitrile; buffers; drug formulations; eyes; guaifenesin; high performance liquid chromatography; maleates; pH; phenylephrine; phosphates; quantitative analysis; rabbits; solvents; triethylamine; wavelengths
Abstract:
... Ketorolac tromethamine (KTC) with phenylephrine hydrochloride (PHE) binary mixture (mixture 1) and their ternary mixture with chlorpheniramine maleate (CPM) (mixture 2) were analyzed using a validated HPLC-DAD method. The developed method was suitable for the in vitro as well as quantitative analysis of the targeted mixtures in rabbit aqueous humor. The analysis in dosage form (eye drops) was a st ...
DOI:
10.1016/j.jchromb.2017.10.024

5. Development of a reversed phase liquid chromatographic method for analysis of pyridoxal‐5′‐phosphate and its impurities

Author:
Marwa Fouad Mansour,   et al.   ; Micheal Assefa; Ahmed El‐Khouly; Peixi Zhu; Ann Van Schepdael; Erwin Adams;     Show all 6 Authors
Source:
Electrophoresis 2018 v.39 no.20 pp. 2540-2549
ISSN:
0173-0835
Subject:
acetonitrile; ammonium; chemical species; electrophoresis; formates; formic acid; ionization; liquid chromatography; pyridoxal phosphate; quality control; spectrometers
Abstract:
... Since no proper method is available in literature for the analysis of pyridoxal‐5′‐phosphate, a reversed phase liquid chromatographic method was developed and validated for specificity, sensitivity, linearity, precision and accuracy. Nine potential related substances and forced degradation products could be successfully separated from the main peak. The separation was achieved on a Polaris C18 col ...
DOI:
10.1002/elps.201800066

6. LC–MS/MS bioassay of four proton pump inhibitors

Author:
Marwa A. Fouad,   et al.   ; Ehab F. Elkady; Bushra M. Jaadan;     Show all 3 Authors
Source:
Journal of chromatography 2018 v.1076 pp. 61-69
ISSN:
1570-0232
Subject:
acetonitrile; ammonium; bioassays; chromatography; drugs; formates; guidelines; humans; ionization; lansoprazole; methanol; monitoring; proteins; proton pump inhibitors; regression analysis; temperature
Abstract:
... A new validated bio-analytical LC–MS/MS method was developed for the simultaneous extraction and determination of four proton pump inhibitors: esomeprazole, lansoprazole, pantoprazole and rabeprazole in human plasma using escitalopram as an internal standard. The proteins in plasma samples were precipitated using acetonitrile for the extraction of analytes which is a simple economic method. The se ...
DOI:
10.1016/j.jchromb.2018.01.022

7. QSRR modeling for the chromatographic retention behavior of some β-lactam antibiotics using forward and firefly variable selection algorithms coupled with multiple linear regression

Author:
Marwa A. Fouad,   et al.   ; Enas H. Tolba; Manal A. El-Shal; Ahmed M. El Kerdawy;     Show all 4 Authors
Source:
Journal of chromatography 2018 v.1549 pp. 51-62
ISSN:
0021-9673
Subject:
Lampyridae; acetonitrile; algorithms; beta-lactam antibiotics; beta-lactams; buffers; chromatography; experimental design; models; pH; phosphates; regression analysis
Abstract:
... The justified continuous emerging of new β-lactam antibiotics provokes the need for developing suitable analytical methods that accelerate and facilitate their analysis. A face central composite experimental design was adopted using different levels of phosphate buffer pH, acetonitrile percentage at zero time and after 15 min in a gradient program to obtain the optimum chromatographic conditions f ...
DOI:
10.1016/j.chroma.2018.03.042

8. A selective and highly sensitive high performance liquid chromatography with fluorescence derivatization approach based on Sonogashira coupling reaction for determination of ethinyl estradiol in river water samples

Author:
Marwa F.B. Ali,   et al.   ; Yurina Uejo; Naoya Kishikawa; Kaname Ohyama; Naotaka Kuroda;     Show all 5 Authors
Source:
Journal of chromatography 2020 v.1628 pp. 461440
ISSN:
0021-9673
Subject:
acetonitrile; copper; derivatization; detection limit; ecosystems; estradiol; fluorescence; high performance liquid chromatography; human health; iodobenzenes; pH; palladium; river water
Abstract:
... A selective and highly sensitive high performance liquid chromatography (HPLC) with fluorescence derivatization method was developed for determination of ethinyl estradiol (EE); one of endocrine-disrupting compounds (EDCs). The fluorescence derivatization procedure was based on Sonogashira coupling reaction using 4-(4, 5-diphenyl-1H-imidazole-2-yl) iodobenzene (DIB-I), a fluorescence labeling reag ...
DOI:
10.1016/j.chroma.2020.461440

9. A bio-analytically validated HPLC-UV method for simultaneous determination of doripenem and ertapenem in pharmaceutical dosage forms and human plasma: a dual carbapenem regimen for treatment of drug-resistant strain of Klebsiella pneumoniae

Author:
Marwa F. B. Ali,   et al.   ; Mostafa A. Marzouq; Samiha A. Hussein; Baher I. Salman;     Show all 4 Authors
Source:
RSC advances 2021 v.11 no.5 pp. 3125-3133
ISSN:
2046-2069
Subject:
Klebsiella pneumoniae; acetonitrile; calibration; doripenem; drug resistance; ertapenem; humans; methanol; pH; phosphates; pneumonia
Abstract:
... The emergence of strains resistant to certain antibiotics is turning into an important issue worldwide that threatens global health with the increasing incidence of carbapenemase-producing Klebsiella pneumoniae (KPC). Thus, successful doripenem–ertapenem (DOR–ERTA) combination is highly recommended in treatment of bacteremic ventilator-associated pneumonia due to Klebsiella pneumoniae. Hence, a fa ...
DOI:
10.1039/d0ra10466c

10. HPLC with fluorescence detection for the bioanalysis and pharmacokinetic study of Doxorubicin and Prodigiosin loaded on eco-friendly casein nanomicelles in rat plasma

Author:
Marwa A.A. Ragab,   et al.   ; Sara I. Aboras; Mohamed A. Korany; Heba H. Abdine; Ahmed El Diwany; Mona M. Agwa;     Show all 6 Authors
Source:
Journal of chromatography 2021 v.1187 pp. 123043
ISSN:
1570-0232
Subject:
acetonitrile; ammonium acetate; casein; doxorubicin; drug delivery systems; fluorescence; fluorometry; hydrophilicity; intravenous injection; methanol; micelles; pH; pharmacokinetics; prodigiosin; rats
Abstract:
... A rapid, efficient, and sensitive liquid chromatographic assay hyphenated to fluorometric detector (HPLC-FLD) was developed and validated for the determination of doxorubicin (DXR) and prodigiosin (PDG) in rat plasma. The sample pre-treatment involves a protein precipitation with acetonitrile with satisfying extraction efficiency (98% and 85% for DXR and PDG, respectively). The chromatographic sep ...
DOI:
10.1016/j.jchromb.2021.123043

11. Second-derivative synchronous fluorimetry and time-programmed HPLC-fluorescence detection for simultaneous estimation of flibanserin and sitagliptin phosphate in synthetic mixtures and human plasma samples

Author:
Marwa S. Moneeb,   et al.   ; Miranda F. Kamal; Samir Morshedy; Dina A. Saad;     Show all 4 Authors
Source:
Journal of chromatography 2021 v.1184 pp. 122955
ISSN:
1570-0232
Subject:
Food and Drug Administration; acetonitrile; ambient temperature; blood glucose; diabetes mellitus; drug interactions; females; fluorometry; high performance liquid chromatography; humans; hypoglycemia; hypoglycemic agents; pH; phosphates; premenopause; risk; spectroscopy
Abstract:
... Diabetes Mellitus is directly related to female anaphrodesia. Female Viagra or Flibanserin (FLB), U.S. FDA approved in 2015, is specifically indicated for premenopausal Hypoactive Sexual Desire Disorder, HSDD, which is one of the primary consequences of Diabetes Mellitus. Simultaneous analysis of the concomitantly administered, FLB and oral antidiabetics, as Sitagliptin phosphate (STG), is a cruci ...
DOI:
10.1016/j.jchromb.2021.122955

12. Evaluation of synthesized polyaniline nanofibres as corrosion protection film coating on copper substrate by electrophoretic deposition

Author:
Marwa F. Elkady,   et al.   ; Mohammed Fuseini; Moustafa Mahmoud Yousry Zaghloul; Ahmed H. El-Shazly;     Show all 4 Authors
Source:
Journal of materials science 2022 v.57 no.10 pp. 6085-6101
ISSN:
0022-2461
Subject:
acetonitrile; ambient temperature; cathodes; colloids; copper; corrosion; electric potential difference; electrolytes; electrophoresis; formic acid; liquids; nanofibers; polyaniline; zeta potential
Abstract:
... In this current paper, we report the use of inexpensive, simple electrophoretic deposition (EPD) technique in developing polyaniline (PANI) aqueous colloidal suspension coating on copper (Cu) substrate. Polyaniline nanoparticle films were deposited electrophoretically on the surface of copper sheet electrode. A colloidal suspension with high stability was produced by a liquid polyaniline in the pr ...
DOI:
10.1007/s10853-022-06994-3