Results 331 to 340 of about 1,704,789 (385)

P1: GC-MS or GC-MS/MS for the determination of ethyl glucuronide in hair?

Toxicologie Analytique et Clinique, 2014
Introduction Ethyl glucuronide (EtG) in hair is currently used as a long-term alcohol marker, and methods with low LOQs are required to differentiate teetotalers from moderate drinkers according to the cut-offs (i.e., 7 pg/mg hair). The determination of EtG may be performed by either LC-MS/MS or GC-(MS/)MS. The use of negative ion chemical ionization (
Delphine Cappelle, Michel Yegles, Adrian Covaci, Hugo Neels, Cleo L. Crunelle, A.L.N. van Nuijs   +5 more
openaire   +2 more sources

Rapid and Simultaneous Analysis of 360 Pesticides in Brown Rice, Spinach, Orange, and Potato Using Microbore GC-MS/MS.

Journal of Agricultural and Food Chemistry, 2017
A multiresidue method for the simultaneous and rapid analysis of 360 pesticides in representative agricultural produce (brown rice, orange, spinach, and potato) was developed using a modified QuEChERS procedure combined with gas chromatography-tandem ...
Jonghwa Lee, Leesun Kim, Yongho Shin, Junghak Lee, Jiho Lee, Eunhye Kim, J. Moon, Jeong-Han Kim   +7 more
semanticscholar   +1 more source

eRah: A Computational Tool Integrating Spectral Deconvolution and Alignment with Quantification and Identification of Metabolites in GC/MS-Based Metabolomics.

Analytical Chemistry, 2016
Gas chromatography coupled to mass spectrometry (GC/MS) has been a long-standing approach used for identifying small molecules due to the highly reproducible ionization process of electron impact ionization (EI).
Xavier Domingo-Almenara, J. Brezmes, M. Vinaixa, S. Samino, N. Ramírez, M. Ramón-Krauel, C. Lerin, M. Díaz, L. Ibáñez, X. Correig, A. Perera-Lluna, Ó. Yanes   +11 more
semanticscholar   +1 more source

GC—MS procedure for the analysis of zipeprol

Journal of Pharmaceutical and Biomedical Analysis, 1993
A sensitive and specific quantitative method for the determination of zipeprol, a newly abused antitussive, in human fluids is described. Zipeprol and an internal standard, levallorphan, are isolated by a basic extraction and back-extraction process. The final extract is derivatizated with BSTFA + 1% TMCS and separated on a 12-m HP-1 capillary column ...
Albert Jaeger, Françoise Flesch, Pascal Kintz, Patrice Mangint   +3 more
openaire   +3 more sources

Revelation of volatile contributions in green teas with different aroma types by GC-MS and GC-IMS.

Food Research International, 2023
Nanfeng Liu, Shanshan Shen, Lunfang Huang, Guojian Deng, Yuming Wei, Jingming Ning, Yujie Wang   +6 more
semanticscholar   +1 more source

Characterization of selected commercially available grilled lamb shashliks based on flavor profiles using GC-MS, GC × GC-TOF-MS, GC-IMS, E-nose and E-tongue combined with chemometrics.

Food Chemistry, 2023
Che-huan Shen, Yun Cai, Xinnan Wu, Shengmei Gai, Bo Wang, Dengyong Liu   +5 more
semanticscholar   +1 more source

GC-MS of Auxins

1986
The frequent lack of correlation between endogenous levels of auxins and selected physiological processes which has often been reported in the literature suggests the conclusion that such correlations do not often exist. However, from a critical evaluation of the methods used for such studies, it is apparent that most of the qualitative and ...
openaire   +2 more sources

Characterization of the aroma profiles of oolong tea made from three tea cultivars by both GC-MS and GC-IMS.

Food Chemistry, 2021
Xiangyang Guo, W. Schwab, Chi-Tang Ho, Chuankui Song, Xiaochun Wan   +4 more
semanticscholar   +1 more source

Comparison of GC-MS/MS and LC-MS/MS for the analysis of hormones and pesticides in surface waters: advantages and pitfalls

Analytical Methods, 2019
The occurrence of endocrine disrupting chemicals (EDCs) in aquatic environments has long been a concern because of their threat to human and aquatic health.
P. He, D. Aga
semanticscholar   +1 more source

Sauber ins GC/MS

Nachrichten aus der Chemie, 2010
AbstractUm Pestizidrückstände in Obst und Gemüse zu analysieren, ist eine Extraktion mit anschließender GC/MS‐Analyse die Methode der Wahl. Die Rohextrakte enthalten aber meist noch schwer verdampfbare Bestandteile. Die Lösung des Problems: ein zwischengeschalteter automatisierter Reinigungsschritt.
openaire   +2 more sources