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You searched for: Subject term chemical species Remove constraint Subject term: chemical species Subject term ethyl ether Remove constraint Subject term: ethyl ether
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1. 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

2. 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

3. Feasibility of gas chromatography-atmospheric pressure photoionization–high-resolution mass spectrometry for the analysis of polychlorinated dibenzo-p-dioxins, dibenzofurans, and dioxin-like polychlorinated biphenyls in environmental and feed samples

Author:
J. F. Ayala-Cabrera; M. Ábalos; E. Abad; E. Moyano; F. J. Santos
Source:
Analytical and bioanalytical chemistry 2020 v.412 no.15 pp. 3703-3716
ISSN:
1618-2642
Subject:
analytical chemistry; atmospheric pressure; benzene; chemical species; dibenzofuran; ethyl ether; feed evaluation; furans; mass spectrometry; polychlorinated biphenyls; polychlorinated dibenzodioxins
Abstract:
... In this work, the suitability of atmospheric pressure photoionization (APPI) has been assessed for the determination of polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (dl-PCBs) by gas chromatography–high-resolution mass spectrometry (GC-HRMS). The APPI of target compounds has been tested in both positive and negative ion modes. Under positive ion m ...
DOI:
10.1007/s00216-020-02615-7

4. Novel use of PDMS tubing for in-soil capture of plant natural products

Author:
J. Vuts; D.M. Magalhães; A.L. Soares; A.A.W. Ratnayaka; J.C. Caulfield; M.A. Birkett
Source:
Journal of chromatography 2020 v.1161 pp. 122451
ISSN:
1570-0232
Subject:
Diabrotica; chemical ecology; chemical species; corn; electrophysiology; ethyl ether; lipophilicity; methanol; polydimethylsiloxane; rhizosphere; sand; semiochemicals; silicon; soil; solvents; vapors; water content
Abstract:
... The extraction of small lipophilic molecules (SLMs) in the soil-root interface that play a role in belowground ecological interactions between plants and insect herbivores was investigated. Polydimethylsiloxane (PDMS) microtubing has been shown to absorb root SLMs selectively in low-disturbance setups, where analytes were extracted from the polymer with methanol. This technique was adapted to isol ...
DOI:
10.1016/j.jchromb.2020.122451

5. Using porcine bone marrow to analyze fenproporex and its metabolite amphetamine for forensic toxicological purposes: method development and validation

Author:
Elisangela de S. Santos; Eliani Spinelli; Francisco R. de Aquino Neto; Silvana V. Rodrigues
Source:
Analytical methods 2017 v.9 no.27 pp. 4060-4069
ISSN:
1759-9679
Subject:
amphetamine; bone marrow; chemical species; cleaning; detection limit; ethyl ether; evaporation; forensic sciences; gas chromatography-mass spectrometry; illicit drugs; liquid-liquid extraction; metabolites; pH; proteinases; quantitative analysis; solvents; swine; toxicology
Abstract:
... The possibility of detecting drugs of abuse in bone marrow represents an important issue in forensic toxicology. Bone marrow is an alternative matrix for cases in which the matrices commonly used in forensic practice are unavailable or unfeasible for analysis. The aim of this study was to develop a method for bone cleaning and bone marrow pretreatment and subsequently validate a quantitative metho ...
DOI:
10.1039/c7ay00807d

6. A single analytical procedure for the simultaneous and confirmatory determination of melamine and related compounds in various food matrices by isotope dilution gas chromatography-mass spectrometry (ID-GC-MS)

Author:
Yee-Lok Wong; Chuen-shing Mok
Source:
Analytical methods 2013 v.5 no.9 pp. 2305-2314
ISSN:
1759-9679
Subject:
chemical species; derivatization; dried milk; ethyl ether; food matrix; gas chromatography-mass spectrometry; ion exchange; isotope dilution technique; isotope labeling; litigation; melamine; methylene chloride; milk; monitoring; muscles; organosilicon compounds; pork; pyridines; screening; solid phase extraction; solvents; sonication; uncertainty
Abstract:
... An analytical procedure for the simultaneous and confirmatory determination of melamine and related compounds, viz. ammeline, ammelide and cyanuric acid, in various food matrices (including milk, milk powder, cereal, biscuit and porcine muscle) using isotope dilution gas chromatography-mass spectrometry (ID-GC-MS) has been developed. In brief, the target analytes were extracted from a homogenised ...
DOI:
10.1039/c3ay26459a

7. Screening and confirmatory GC-MS methods for the detection of trenbolone in bovine urine

Author:
Barbara Woźniak; Iwona Matraszek-Żuchowska; Stanisław Semeniuk; Alicja Kłopot; Jan Żmudzki
Source:
Bulletin of the Veterinary Institute in Puławy = 2013 v.57 no.4 pp. 559-566
ISSN:
2300-3235
Subject:
acetates; cattle; chemical species; derivatization; enzymatic hydrolysis; ethyl ether; metabolites; pH; standard deviation; trenbolone; urine
Abstract:
... Sensitive and selective methods for the screening (GC-MS) and confirmatory analysis (GC-MS/MS) of 17α- and 17β- trenbolone in bovine urine were developed. In the first stage of the analysis, the enzymatic hydrolysis of trenbolone metabolites with glucuronidase AS-HP in acetate buffer (pH 5.2) solution was carried out. Free compounds were extracted from urine with diethyl ether. For the purificatio ...
DOI:
10.2478/bvip-2013-0096

8. Determination of Zeranol and its Metabolites in Bovine Muscle Tissue with Gas Chromatography-Mass Spectrometry

Author:
Iwona Matraszek-Żuchowska; Barbara Woźniak; Jan Żmudzki
Source:
Bulletin of the Veterinary Institute in Puławy = 2012 v.56 no.3 pp. 335-342
ISSN:
2300-3235
Subject:
European Union; ammonium; cattle; chemical species; ethyl ether; gas chromatography-mass spectrometry; iodides; ionization; liquid-liquid extraction; metabolites; muscle tissues; quantitative analysis; solid phase extraction; zeranol
Abstract:
... This paper describes the quantitative method of determination of chosen substances from resorcylic acid lactones group: zeranol, taleranol, α-zearalenol, β-zearalenol, and zearalanone in bovine muscle tissue. The presented method is based on double diethyl ether liquid-liquid extraction (LLE), solid phase extraction (SPE) clean up, and gas chromatography mass spectrometry (GC-MS) analysis. The res ...
DOI:
10.2478/v10213-012-0059-4