Results 11 to 20 of about 191,958 (259)

Identification and quantification of polyfunctionalized hopanoids by high temperature gas chromatography–mass spectrometry [PDF]

Organic Geochemistry, 2013
Hopanoids are triterpenoids produced mainly by bacteria, are ubiquitous in the environment, and have many important applications as biological markers. A wide variety of related hopanoid structures exists, many of which are polyfunctionalized. These modifications render the hopanoids too involatile for conventional gas chromatography (GC) separation ...
Sessions, Alex L., Zhang, Lichun, Welander, Paula V., Doughty, David, Summons, Roger E., Newman, Dianne K.   +5 more
openaire   +6 more sources

Discrimination of Pakistani Fountain Pen Inks by Gas Chromatography-Mass Spectrometry (GC-MS)

International Journal of Analytical Chemistry, 2022
In developing countries, the chances of fraud in written documents are comparatively high. Therefore, comparison of fountain pen inks is especially imperative in examination of forensic questioned documents.
Mehwish Sharif, Muhammad Irfan Jalees, Syed Azhar Ali Shah Tirmazi, Muhammad Makshoof Athar, Arjumand Iqbal Durrani, Madeeha Batool   +5 more
doaj   +1 more source

State-of-the-Art Analytical Approaches for Illicit Drug Profiling in Forensic Investigations

Molecules, 2022
In forensic chemistry, when investigating seized illicit drugs, the profiling or chemical fingerprinting of drugs is considered fundamental. This involves the identification, quantitation and categorization of drug samples into groups, providing ...
Reem Ahmed, Mohamad J. Altamimi, Mayssa Hachem   +2 more
doaj   +1 more source

Characterization of Aroma Compounds in Cooked Sorghum Using Comprehensive Two-Dimensional Gas Chromatography-Time-of-Flight Mass Spectrometry and Gas Chromatography-Olfactometry-Mass Spectrometry

Molecules, 2021
Sorghum is the major raw material for the production of Chinese Baijiu (Chinese liquor) and has a great effect on the flavor of Baijiu. Volatiles in cooked glutinous and non-glutinous sorghum samples were extracted using solid-phase microextraction (SPME)
Shuang Chen, Li Wang, Derang Ni, Lin Lin, Heyu Wang, Yan Xu   +5 more
doaj   +1 more source

Gas chromatography-mass spectrometry in the taxonomy of Miscanthus

Вавиловский журнал генетики и селекции, 2020
Chemotaxonomy as a system approach deals with intra- and interspecific polymorphism of a group of taxa in order to clarify their taxonomic positions or to select material for selection or introduction.
N. M. Slynko, N. V. Burmakina, O. M. Potseluyev, S. Yu. Kapustyanchik, G. Yu. Galitsin, T. N. Goryachkovskaya, L. V. Kuybida, S. V. Shekhovtsov, S. E. Peltek, V. K. Shumny   +9 more
doaj   +1 more source

Blood-Based Lipidomics Approach to Evaluate Biomarkers Associated With Response to Olanzapine, Risperidone, and Quetiapine Treatment in Schizophrenia Patients

Frontiers in Psychiatry, 2018
This is the first study to identify lipidomic markers in plasma associated with response of acutely ill schizophrenia patients in response to specific antipsychotic treatments.
Adriano Aquino, Guilherme L. Alexandrino, Paul C. Guest, Fabio Augusto, Alexandre F. Gomes, Michael Murgu, Johann Steiner, Johann Steiner, Daniel Martins-de-Souza, Daniel Martins-de-Souza, Daniel Martins-de-Souza   +10 more
doaj   +1 more source

Pipecolic Acid Quantification Using Gas Chromatography-coupled Mass Spectrometry

Bio-Protocol, 2020
Pipecolic acid (Pip), a non-proteinacious product of lysine catabolism, is an important regulator of immunity in plants and humans alike. For instance, Pip accumulation is associated with the genetic disorder Zellweger syndrome, chronic liver diseases ...
Keshun Yu, huazhen liu, Pradeep Kachroo
doaj   +1 more source

IDENTIFICATION OF BIOACTIVE COMPONENTS IN ENHALUS ACOROIDES SEAGRASS EXTRACT BY GAS CHROMATOGRAPHY–MASS SPECTROMETRY

Asian Journal of Pharmaceutical and Clinical Research, 2018
Objective: This study deals with the determination of possible phytocompounds present in the ethyl acetate extract of Enhalus acoroides using gas chromatography-mass spectroscopy (GC-MS) technique. Methods: Using GC-MS technique the phytocompounds present in the ethyl acetate extract of E. acoroides whole seagrass was investigated, and the mass spectra
Jayalakshmi M, Vanitha, N. Pushpabharathi, Amudha P   +3 more
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PHYTOCHEMICAL ANALYSIS OF PORTULACA OLERACEA AND PORTULACA QUADRIFIDA EXTRACTS USING GAS CHROMATOGRAPHY–MASS SPECTROMETRY

Asian Journal of Pharmaceutical and Clinical Research, 2018
Objective: The two plant species Portulaca oleracea and Portulaca quadrifida are commonly known as purslane and chickweed, respectively. They are typically consumed as salad or pickle. Traditional systems of medicine from Africa and China have described these plants belonging to family Portulacaceae as remedies against a host of diseases.
Trupti P Durgawale, Chitra C Khanwelkar, Pratik P Durgawale   +2 more
openaire   +3 more sources

Simultaneous Determination of 20 Pyrazines in Baijiu by Gas Chromatography-Tandem Mass Spectrometry [PDF]

Shipin Kexue
In this study, a method for the simultaneous determination of 20 pyrazines in baijiu was established by direct injection (DI) combined with gas chromatography-tandem mass spectrometry (GC-MS/MS), and the pyrazines in 10 brands of baijiu with different ...
WANG Na, SHEN Yi, ZHUANG Yuan, CHENG Wei, LUO Sen, ZHANG Yadong, LIU Zixuan, LIU Bing, GAO Hongbo
doaj   +1 more source