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You searched for: Subject term chemical species Remove constraint Subject term: chemical species Subject term hexanoic acid Remove constraint Subject term: hexanoic acid
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1. Organic acids and alcohols quantification by HPLC/RID in sugarcane vinasse: analytical method validation and matrix effect assessment

Author:
Alan Nascimento Bernardes; Leandro Augusto Gouvêa Godoi; Priscila Rosseto Camiloti; Absai da Conceição Gomes; Bruna Larissa Sandy Sanchez; Ana Paula Rodrigues Torres; Lívia Silva Botta
Source:
International journal of environmental analytical chemistry 2021 v.101 no.3 pp. 325-336
ISSN:
1029-0397
Subject:
acetic acid; alcoholic fermentation; analytical chemistry; butanol; butyric acid; chemical species; citric acid; ethanol; glycerol; hexanoic acid; high performance liquid chromatography; lactic acid; methanol; molasses; propionic acid; refractive index; succinic acid; sugarcane juice; valeric acid; vinasse; wastewater
Abstract:
... The composition of sugarcane vinasse varies according to the substrate of alcoholic fermentation, e.g. if it is sugarcane juice and/or molasses. Regardless of the origin, the main organic compounds found in sugarcane vinasse are organic acids, alcohols and a low amount of carbohydrates. To access the organic composition of such wastewater, the present paper describes a high-performance liquid chro ...
DOI:
10.1080/03067319.2019.1666833

2. Vortex‐assisted dispersive liquid‐phase microextraction for the analysis of main active compounds from Zi‐Cao‐Cheng‐Qi decoction based on a hydrophobic deep eutectic solvent

Author:
Jiao Xue; Li Yang; Xuan Chen; Xiao‐Hong Bai; Shuang Hu
Source:
Journal of separation science 2021 v.44 no.24 pp. 4376-4383
ISSN:
1615-9306
Subject:
calibration; centrifugation; chemical species; chlorides; hexanoic acid; high performance liquid chromatography; hydrophobicity; liquid-phase microextraction; pH; salt concentration; separation; solvents; tetrabutylammonium compounds
Abstract:
... In this study, a vortex‐assisted hydrophobic deep eutectic solvent dispersive liquid‐phase microextraction was developed and used for the extraction and preconcentration of six main active compounds in Zi‐Cao‐Cheng‐Qi decoction. The deep eutectic solvent, prepared by mixing tetrabutylammonium chloride and hexanoic acid at a molar ratio of 1:1, was added to the sample solution containing the analyt ...
DOI:
10.1002/jssc.202100270

3. A simplified method for the quantitation of short-chain fatty acids in human stool

Author:
B. Loye Eberhart; Annette S. Wilson; Stephen J.D. O'Keefe; Matsepo C. Ramaboli; Lucky T. Nesengani
Source:
Analytical biochemistry 2021 v.612 pp. 114016
ISSN:
0003-2697
Subject:
accuracy; butyric acid; chemical species; detection limit; ethyl ether; extraction; feces; formic acid; hexanoic acid; humans; isobutyric acid; measurement; propionic acid; research; sampling; sodium sulfate; valeric acid
Abstract:
... A one-vial extraction method for the quantitation of short-chain fatty acids (SCFAs) in human stool was developed. Samples were extracted with an acidified aqueous internal standard solution, sodium sulfate, and diethyl ether, followed by analysis with GC-FID. Accuracy, in terms of relative recovery, was typically between 90 and 110% for most analytes; without internal standard, the accuracy was a ...
DOI:
10.1016/j.ab.2020.114016

4. Development and validation of a GC-FID method for the analysis of short chain fatty acids in rat and human faeces and in fermentation fluids

Author:
Serena Scortichini; Maria Chiara Boarelli; Stefania Silvi; Dennis Fiorini
Source:
Journal of chromatography 2020 v.1143 pp. 121972
ISSN:
1570-0232
Subject:
acetic acid; acidification; chemical species; derivatization; ethyl ether; feces; fermentation; flame ionization; hexanoic acid; humans; intestinal microorganisms; metabolites; mice; polyethylene glycol; propionic acid; quantitative analysis; rats
Abstract:
... Short-chain fatty acids (SCFAs) are gut microbiota metabolites recognized for their beneficial effects on the host organism. In this study, a simple and rapid sample preparation method combined to SCFAs analysis by direct injection and gas chromatography coupled with flame ionization detection (GC-FID), for the determination and quantification of eight SCFAs (acetic, propionic, i-butyric, butyric, ...
DOI:
10.1016/j.jchromb.2020.121972

5. In-a-syringe surfactant-assisted dispersive liquid-liquid microextraction of polycyclic aromatic hydrocarbons in supramolecular solvent from tea infusion

Author:
Irina Timofeeva; Kira Stepanova; Andrey Bulatov
Source:
Talanta 2021 v.224 pp. 121888
ISSN:
0039-9140
Subject:
automation; centrifugation; chemical species; cleaning; detection limit; emulsifiers; emulsions; flow; fluorescence; hexanoic acid; high performance liquid chromatography; hydrophilicity; liquid-phase microextraction; mixing; polycyclic aromatic hydrocarbons; reproducibility; separation; sodium; solvents; syringes; tea
Abstract:
... In this work, an automated surfactant-assisted dispersive liquid-liquid microextraction approach based on in-a-syringe concept was developed for the first time. The procedure assumed mixing aqueous sample phase and hydrophilic emulsion containing hexanoic acid and sodium hexanoate in a syringe of flow system. Sodium hexanoate acted as an emulsifier in dispersive liquid-liquid microextraction proce ...
DOI:
10.1016/j.talanta.2020.121888

6. Three-dimensional pompon-like Au/ZnO porous microspheres as solid phase microextraction coating for determination of volatile fatty acids from foot odor

Author:
Shengrui Xu; Qingqing Liu; Cuicui Wang; Li Xiao; Suling Feng; Ning Li; Chang-Po Chen
Source:
Talanta 2020 v.209 pp. 120519
ISSN:
0039-9140
Subject:
butyric acid; chemical species; coatings; cotton; desorption; detection limit; gas chromatography-mass spectrometry; gold; headspace analysis; hexanoic acid; humans; microparticles; models; nanowires; odors; propionic acid; regression analysis; scanning electron microscopy; solid phase microextraction; stainless steel; temperature; transmission electron microscopy; volatile fatty acids; zinc oxide
Abstract:
... In this study, facile fabrication of three-dimensional (3D) pompon-like gold/zinc oxide (Au/ZnO) porous microspheres by hydrothermal procedure was investigated. These microspheres were utilized as solid phase microextraction (SPME) coating for determination of volatile fatty acids (VFAs) from foot odor coupling with gas chromatography-mass spectrometry (GC-MS). SEM and TEM characterizations showed ...
DOI:
10.1016/j.talanta.2019.120519