Results 1 to 10 of about 227,063 (146)

Longitudinal Plasma Metabolomics by GC–MS and LC–MS During Total Parenteral Nutrition After Gastrointestinal Surgery [PDF]

Metabolites
Background: Total parenteral nutrition (TPN) is widely used after major gastrointestinal surgery; however, its early systemic metabolic effects and temporal adaptation patterns remain incompletely characterized.
Duygu Konuklu, Cemil Can Eylem, İpek Baysal, Busenur Kırımtay, Emirhan Nemutlu, Timuçin Erol, Şermin Ataç, İncilay Süslü   +7 more
doaj   +2 more sources

Optimization of an Analytical Method for Indoxacarb Residues in Fourteen Medicinal Herbs Using GC–μECD, GC–MS/MS and LC–MS/MS

Separations, 2022
Pesticide residue analysis in medicinal herbs is a challenging task because of the matrix effect and its influence on quantitative analysis despite the continuous development of several new analytical methods and instrumentations.
Hun-Ju Ham, Syed Wasim Sardar, Abd Elaziz Sulieman Ahmed Ishag, Jeong-Yoon Choi, Jang-Hyun Hur   +4 more
doaj   +1 more source

Metabolomics Benefits from Orbitrap GC–MS—Comparison of Low- and High-Resolution GC–MS

Metabolites, 2020
The development of improved mass spectrometers and supporting computational tools is expected to enable the rapid annotation of whole metabolomes. Essential for the progress is the identification of strengths and weaknesses of novel instrumentation in ...
Daniel Stettin, Remington X. Poulin, Georg Pohnert   +2 more
doaj   +1 more source

Analysis of Pectin-derived Monosaccharides from Arabidopsis Using GC–MS

Bio-Protocol, 2023
Pectin is a complex polysaccharide present in the plant cell wall, whose composition is constantly remodelled to adapt to environmental or developmental changes.
Patricia Scholz, Kent Chapman, Till Ischebeck, Athanas Guzha   +3 more
doaj   +1 more source

GC‒MS analysis of fatty acids of Malvaviscus arboreus leaves [PDF]

Journal of Advanced Biomedical and Pharmaceutical Sciences, 2021
Malvaceae plants have been reported to produce a wide range of structurally varied fatty acids. Therefore, in this work, the fatty acid content of Malvaviscus arboreus Cav.
Usama Abdelmohsen, Samar Desoukey, Omnia Abdelhafez, John Fahim   +3 more
doaj   +1 more source

GC-MS and GC×GC-ToF-MS analysis of roasted / broth flavors produced by Maillard reaction system of cysteine-xylose-glutamate

Current Research in Food Science, 2023
Maillard reaction products (MRPs) with roasted/broth flavors were prepared and analyzed for the resulting flavor differences. The identification of volatile compounds in MRPs was carried out by GC-MS and GC × GC-ToF-MS.
An-Ran Zheng, Chao-Kun Wei, Dun-Hua Liu, Kiran Thakur, Jian-Guo Zhang, Zhao-Jun Wei   +5 more
doaj   +1 more source

4-t-Butylbenzylation of carboxylic acid for GC–MS analysis

SN Applied Sciences, 2020
We report a 4-t-butylbenzyl derivatization for the analysis of carboxylic acids by GC–MS (EI). Carboxylic acids were analyzed as a 4-t-butylbenzyl ester after the derivatization with 4-t-butylbenzyl bromide. On the mass spectra of 4-t-butylbenzyl ester, [
Shinji Tsunoi, Nao Yamamoto, Tomohiro Yasuhisa, Riko Akehi, Itaru Suzuki, Ikuya Shibata   +5 more
doaj   +1 more source

Comparison of an Offline SPE–GC–MS and Online HS–SPME–GC–MS Method for the Analysis of Volatile Terpenoids in Wine

Molecules, 2020
The aroma profile is an important marker for wine quality. Various classes of compounds are responsible for the aroma of wine, and one such class is terpenoids. In the context of this work, a validated gas chromatography−mass spectrometry (GC−
Cody Williams, Astrid Buica
doaj   +1 more source

Application of GC–TOF/MS and GC×GC–TOF/MS to Discriminate Coffee Products in Three States (Bean, Powder, and Brew)

Foods, 2023
The volatiles in coffee play an important part in the overall flavor profile. In this study, GC–TOF/MS and GC×GC–TOF/MS were used to detect the volatile organic compounds (VOCs) in coffee samples of three different brands at three states (bean, powder ...
Xiaolei Fang, Yanping Chen, Jie Gao, Zimu Run, He Chen, Ruoqi Shi, Yingqiu Li, Haihua Zhang, Yuan Liu   +8 more
doaj   +1 more source

Detection of Δ9-tetrahydrocannabinol (THC) in hair using GC–MS

Egyptian Journal of Forensic Sciences, 2014
Detection of drugs from hair samples has become an imperative technique in forensic toxicological analysis. In this study, hair samples were collected from 20 cannabis users undergoing treatment at a rehabilitation center at different time intervals ...
Himanshu Khajuria, Biswa P. Nayak
doaj   +1 more source