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You searched for: Subject term chemical species Remove constraint Subject term: chemical species Subject term feces Remove constraint Subject term: feces
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1. Development and validation of dispersive liquid–liquid microextraction method for the determination of 15 polycyclic aromatic hydrocarbons in 200 Antarctica samples by gas chromatography mass spectrometry

Author:
Maral Selin Fındıkoğlu Ercan; Merve Fırat Ayyıldız; Elif Yazıcı; Berfin Metin; Dotse Selali Chormey; Elif Seda Koçoğlu; Sezgin Bakırdere
Source:
Environmental monitoring and assessment 2022 v.194 no.5 pp. 328
ISSN:
0167-6369
Subject:
calibration; chemical species; ecosystems; energy; feces; fuel combustion; gas chromatography-mass spectrometry; lakes; liquid-phase microextraction; macroalgae; mosses and liverworts; seawater; tourism; transportation; Antarctica
Abstract:
... Antarctica has seen an increase in scientific research and tourism, and anthropogenic activities such as incineration of waste products and fuel combustion for energy and transportation are potential contamination sources to the ecosystem. Polycyclic aromatic hydrocarbons are common products of incomplete combustion of organic compounds and could be among accumulating contaminants in Antarctica. T ...
DOI:
10.1007/s10661-022-09991-w

2. Dispersive solid phase extraction based on reduced graphene oxide modified Fe3O4 nanocomposite for trace determination of parabens in rock, soil, moss, seaweed, feces, and water samples from Horseshoe and Faure Islands

Author:
Zeynep Tekin; Nazime Ebrar Karlıdağ; Nizamettin Özdoğan; Elif Seda Koçoğlu; Sezgin Bakırdere
Source:
Journal of hazardous materials 2022 v.426 pp. 127819
ISSN:
0304-3894
Subject:
acetonitrile; chemical species; feces; graphene oxide; macroalgae; mosses and liverworts; nanocomposites; pH; phosphates; seawater; soil; solid phase extraction; ultrasonic treatment; Antarctic region
Abstract:
... This study reports an efficient, green, sensitive and simple analytical protocol for trace determination of methyl paraben, ethyl paraben, propyl paraben, butylparaben and benzyl paraben by high-performance liquid chromatography-ultraviolet detection (HPLC-UV). The analytes were preconcentrated using an ultrasonication supported (US) dispersive solid phase extraction (DSPE) method based on reduced ...
DOI:
10.1016/j.jhazmat.2021.127819

3. Passive sampling to scale wastewater surveillance of infectious disease: Lessons learned from COVID-19

Author:
Aaron Bivins; Devrim Kaya; Warish Ahmed; Joe Brown; Caitlyn Butler; Justin Greaves; Raeann Leal; Kendra Maas; Gouthami Rao; Samendra Sherchan; Deborah Sills; Ryan Sinclair; Robert T. Wheeler; Cresten Mansfeldt
Source:
Science of the total environment 2022 v.835 pp. 155347
ISSN:
0048-9697
Subject:
COVID-19 infection; RNA; Salmonella Typhi; Severe acute respiratory syndrome coronavirus 2; chemical species; disease surveillance; environment; feces; infrastructure; monitoring; wastewater
Abstract:
... Much of what is known and theorized concerning passive sampling techniques has been developed considering chemical analytes. Yet, historically, biological analytes, such as Salmonella typhi, have been collected from wastewater via passive sampling with Moore swabs. In response to the COVID-19 pandemic, passive sampling is re-emerging as a promising technique to monitor SARS-CoV-2 RNA in wastewater ...
DOI:
10.1016/j.scitotenv.2022.155347

4. Analysis of 39 drugs and metabolites, including 8 glucuronide conjugates, in an upstream wastewater network via HPLC-MS/MS

Author:
Katelyn S. Foppe; Elizabeth B. Kujawinski; Claire Duvallet; Noriko Endo; Timothy B. Erickson; Peter R. Chai; Mariana Matus
Source:
Journal of chromatography 2021 v.1176 pp. 122747
ISSN:
1570-0232
Subject:
biochemical pathways; case studies; chemical species; drug excretion; epidemiology; feces; humans; hydrolysis; metabolites; narcotics; overdose; solid phase extraction; urine; wastewater; wastewater treatment; Massachusetts
Abstract:
... Pharmaceutical compounds ingested by humans are metabolized and excreted in urine and feces. These metabolites can be quantified in wastewater networks using wastewater-based epidemiology (WBE) methods. Standard WBE methods focus on samples collected at wastewater treatment plants (WWTPs). However, these methods do not capture more labile classes of metabolites such as glucuronide conjugates, prod ...
DOI:
10.1016/j.jchromb.2021.122747

5. Leaching of benzimidazole antiparasitics in soil columns and in soil columns amended with sheep excreta

Author:
Rafael Silveira Porto; Rafael Silvio Bonilha Pinheiro; Susanne Rath
Source:
Environmental science and pollution research 2021 v.28 no.42 pp. 59040-59049
ISSN:
0944-1344
Subject:
albendazole; atrazine; benzimidazole; chemical species; clay; ewes; feces; fenbendazole; fertilizers; metabolites; oral administration; pollution; research; risk; soil; soil biota; thiabendazole
Abstract:
... Benzimidazoles are anthelmintics frequently used in sheep farming due to the high susceptibility of these animals to parasitic diseases. Sheep excreta are often disposed onto soils as a fertilizer, and they may contain benzimidazole residues that can contaminate soil and water. This work aimed to assess the leaching behavior of benzimidazole drugs (albendazole, fenbendazole, and thiabendazole) and ...
DOI:
10.1007/s11356-020-08389-w

6. Metabolite profiling of Shuganzhi tablets in rats and pharmacokinetics study of four bioactive compounds with liquid chromatography combined with electrospray ionization tandem mass spectrometry

Author:
Jie Tang; Mengge Shi; Yan Xu; Zhengcai Ju; Huida Guan; Jun Lin; Gan Li; Han Han; Tong Zhang
Source:
Journal of chromatography 2021 v.1179 pp. 122827
ISSN:
1570-0232
Subject:
bile; blood serum; carboxylation; chemical species; electrospray ionization mass spectrometry; emodin; fatty liver; feces; ginsenosides; hesperidin; hospitals; hydrolysis; hydroxylation; metabolites; naringin; oxidation; pharmacokinetics; prototypes; quantitative analysis; rats; spectrometers; urine
Abstract:
... Shuganzhi Tablets (SGZT) is developed on the basis of a clinical empirical formula as a hospital preparation for the treatment of fatty liver. In this study, a rapid and highly sensitive LC-MS/MS method was established and validated for simultaneous determination of ginsenoside Re, ginsenoside Rg1, notoginsenoside R1, naringin, specnuezhenide, emodin, polydatin, hesperidin and saikosaponin A in ra ...
DOI:
10.1016/j.jchromb.2021.122827

7. 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

8. “The quantitative determination of indolic microbial tryptophan metabolites in human and rodent samples: A systematic review”

Author:
George M. Anderson
Source:
Journal of chromatography 2021 v.1186 pp. 123008
ISSN:
1570-0232
Subject:
brain; cerebrospinal fluid; chemical species; chromatography; databases; feces; human health; humans; indole acetic acid; metabolites; metabolome; propionic acid; quantitative analysis; rodents; saliva; skatole; systematic review; tryptamine; tryptophan
Abstract:
... Concentrations reported for indolic microbial metabolites of tryptophan in human and rodent brain, cerebrospinal fluid, plasma, saliva and feces were compiled and discussed. A systematic review of the literature was accomplished by key word searches of Pubmed, Google Scholar and the Human Metabolome Data Base (HMDB), and by searching bibliographies of identified publications including prior review ...
DOI:
10.1016/j.jchromb.2021.123008

9. 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

10. Quantification of microbiota-related phenols and aromatic acids in mouse feces of a diabetic nephropathy model by simultaneous BDAPE derivatization using ultra-performance liquid chromatography-tandem mass spectrometry

Author:
Xiaoli Zheng; Haonan Duan; Feifei Lin; Xiaomei Li; Jianhua Shen; Fanghui Han; Fubao Huang; Shilin Li; Lu Chang; Hui Xu; Kai Wang; Jia Liu
Source:
Analytical and bioanalytical chemistry 2020 v.412 no.13 pp. 3241-3252
ISSN:
1618-2642
Subject:
benzoic acid; chemical species; derivatization; diabetic nephropathy; electrospray ionization mass spectrometry; feces; indole acetic acid; intestines; mice; microorganisms; models; p-cresol; phenol; phenylacetic acid; potassium carbonate; tandem mass spectrometry; toxins; ultra-performance liquid chromatography
Abstract:
... In the intestine, several phenols and aromatic acids are generated by microbiota and are highly related to the formation of uremic toxins. Herein, we developed a new derivatization reagent, 2-bromo-1-[4-(dimethylamino)phenyl] ethyl ketone (BDAPE), that reacted simultaneously with phenols and aromatic acids. Following a reaction within 2 h at 60 °C in the presence of 200 mM potassium carbonate (K₂C ...
DOI:
10.1007/s00216-020-02585-w

11. Toxicokinetics of diisobutyl phthalate and its major metabolite, monoisobutyl phthalate, in rats: UPLC-ESI-MS/MS method development for the simultaneous determination of diisobutyl phthalate and its major metabolite, monoisobutyl phthalate, in rat plasma, urine, feces, and 11 various tissues collected from a toxicokinetic study

Author:
Seung-Hyun Jeong; Ji-Hun Jang; Hea-Young Cho; Yong-Bok Lee
Source:
Food and chemical toxicology 2020 v.145 pp. 111747
ISSN:
0278-6915
Subject:
acetonitrile; chemical species; feces; formic acid; half life; intravenous injection; metabolites; pharmacokinetics; phthalates; rats; risk assessment; toxicity; toxicology; urine
Abstract:
... The aim of this study was to explore the toxicokinetics of diisobutyl-phthalate (DiBP) and its major metabolite, monoisobutyl-phthalate (MiBP), by developing a UPLC-ESI-MS/MS method for simultaneously measuring DiBP and MiBP in rat plasma, urine, feces, and 11 different tissues. For the experiment, 0.1% (v/v) aqueous formic acid and acetonitrile mobile phase by gradient elution at a flow rate of 0 ...
DOI:
10.1016/j.fct.2020.111747

12. Simultaneous determination of short‐chain fatty acids in human feces by HPLC with ultraviolet detection following chemical derivatization and solid‐phase extraction segmental elution

Author:
Huai‐You Wang; Cheng Wang; Lin‐Xiu Guo; Yun‐Feng Zheng; Wei‐Hui Hu; Tina T. X. Dong; Tie‐Jie Wang; Karl W. K. Tsim
Source:
Journal of separation science 2019 v.42 no.15 pp. 2500-2509
ISSN:
1615-9306
Subject:
chemical species; derivatization; feces; high performance liquid chromatography; intestinal microorganisms; metabolites; short chain fatty acids; solid phase extraction
Abstract:
... Short‐chain fatty acids are currently the most studied metabolites of gut microbiota, but the analysis of them, simultaneously, is still challenging due to their unique property and wide concentration range. Here, we developed a sensitive and versatile high‐performance liquid chromatography with ultraviolet detection method, using pre‐column derivatization and solid‐phase extraction segmental elut ...
DOI:
10.1002/jssc.201900249

13. Pharmacokinetic and excretion study of three alkaloids in rats using UPLC-MS/MS after oral administration of menispermi rhizoma capsules

Author:
Jia Yu; Bolin Zhu; Dan Su; Zhen Jiang
Source:
RSC advances 2018 v.8 no.55 pp. 31633-31645
ISSN:
2046-2069
Subject:
acetonitrile; alkaloids; chemical species; excretion; feces; formic acid; ionization; monitoring; oral administration; pharmacokinetics; rats; rhizomes; tandem mass spectrometry; temperature; ultra-performance liquid chromatography; urine
Abstract:
... A sensitive, specific and rapid ultra-performance liquid chromatography tandem mass spectrometry method (UPLC-MS/MS) was developed for simultaneous determination of three main alkaloids (daucicoline, daurisoline, dauricine) in rat plasma, urine and feces after oral administration of menispermi rhizoma capsules. The chromatographic separation was performed on a Waters ACQUITY UPLC® BEH C₁₈ column ( ...
DOI:
10.1039/c8ra04084b