Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Gas Chromatography-mass Spectrometry (GCMS)"”.
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Molecular growth pathways in silica sol-gel polymerization
An analytical protocol involving gas chromatography (GC), gas chromatography-mass spectrometry (GCMS), and 29Si{1H} NMR spectroscopy, was developed to determine the structures of the polysilicate intermediates formed during silica sol-gel polymerization. This protocol allowed the structural …
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Transport of n-alkanes through graphene nanoporous atomically thin membrane
… distinct boiling points allow detection in the gas chromatography-mass spectrometry (GCMS).
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Survey of Flavonoids and Their Distribution in Different Kinds of Onions Using High Performance Liquid Chromatography and Gas Chromatography Mass Spectrometry.
… analyzed subsequently by high performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GCMS). Statistical calculations were done to see if there are significant differences in the varieties of onions studied from the chromatographic profiles obtained. The chromatograms …
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A comprehensive chemical examination of methylamphetamine produced from pseudoephedrine extracted from cold medication
This research evaluates the ability of gas chromatography mass spectrometry (GCMS), isotope ratio mass spectrometry (IRMS) and inductively coupled plasma mass spectrometry (ICPMS) to characterize methylamphetamine hydrochloride synthesised from precursors extracted from proprietary cold medication …
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Chemical communication in the European otter, Lutra lutra
… of ‘digital’ and ‘analogue’ coding. SPME and gas chromatography – mass spectrometry (GCMS) were used to investigate intra- (L.lutra) and inter- specific (L. lutra, A. cinerea, L. canadensis, and badger, Meles meles) differences in the headspace chemicals of otter scent marks. Inter-sanctuary …
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A preliminary analysis of the lipid contents of a biofilm from a Yellowstone hydrothermal pool
… mild alkaline methanolysis and column chromatography to isolate different fractions of the TLE. Compounds were then identified by gas chromatography-mass spectrometry (GCMS). The mild alkaline methanolysis allowed for the identification of decanoic acid methyl ester, a fatty acid methyl …
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Impurity analysis of MDA synthesized from unrestricted compounds
… magnetic resonance spectroscopy (¹HNMR) and gas chromatography-mass spectrometry (GCMS). The results were examined to determine the identity of the impurities and to determine the presence of route specific impurities. The results of this investigation show the identity of multiple impurities …
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An investigation into the ability of three analytical techniques to discriminate batches of methlamphetamine prepared by seven synthetic routes
This project evaluates the abilities of gas chromatography mass spectrometry (GCMS), isotope radio mass spectrometry (IRMS) and inductively coupled plasma mass spectrometry (ICPMS) to characterise methylamphetamine hydrochoride Repetitive batches of samples were prepared using seven synthetic …
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Ethnobotany of traditional vegetables used by Sama-Bajau community in Kota Belud, Sabah, and phytochemical and anti-aging investigation of crassocephalum crepidioides
… was analyzed using High Performance Liquid Chromatography method (HPLC), which revealed the presence of polyphenols, namely, chlorogenic acid, epicatechin, and rutin. Gas Chromatography Mass Spectrometry (GCMS) analysis of ethanol extract revealed 44 phytocompound. Ethanol extract has shown …
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The investigation of pyrolysis products of South African street drug, nyaope
… Pyrolysis products were analysed using Gas Chromatography Mass Spectrometry (GCMS) and High Performance Liquid chromatography (HPLC).<br/><br/>Pyrolysis products of EFV on its own and then in mixtures with other suggested components of the nyaope street drug (methamphetamine, …
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Metabolism and pharmacokinetic studies of valproic acid using stable isotope techniques
… VPA therapy. Stable isotope techniques and gas chromatography mass spectrometry (GCMS) have been used in several areas of research on VPA. For example the application of a stable isotope labelled analog as a "pulse dose" in antiepileptic drug studies allows the elimination kinetics of the …
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Characterizing the effects of hydrothermal processes on bioactive compounds in wastewater bioenergy systems
… down to inactive forms. High performance liquid chromatography (HPLC) analysis of samples before and after HTL treatment showed removal of specific emerging bioactive compounds (florfenicol, ceftiofur and estrone) to below detection limits when HTL was operated at temperatures 250°C for 60 min or …