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 20 of 148 for “"Gas chromatography-mass spectrometry (GC-MS)"”.
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Characterization of human skin emanations by Solid Phase Microextraction (SPME) extraction of volatiles and subsequent analysis by Gas Chromatography-Mass Spectrometry (GC-MS)
… included the rubbing of glass beads on the palms and backs of hands for 20 minutes. The volatile headspace above samples were extracted by a solid-phase microextraction fiber which incorporated a composite coating of liquid polymer matrix and solid porous particles. This protocol provided …
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Test burning of carpet and foam and potential interferences in identifying petrol in arson investigation by gas chromatography/ mass spectrometry
… different burning tests and the evaluation, by gas chromatography/ mass spectrometry (GC/MS), of the burnt residues for the purpose of identifying compounds which may potentially interfere with the identification of petrol in arson investigation.
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Constituents of Aplysina Fistularis
… sponge, Aplysina fistularis, were examined by gas chromatography/mass spectrometry (GC/MS), high pressure liquid chromatography (HPLC) and classical fractionation and purification procedures. GC/MS indicated that many brominated tyrosine metabolites were accumulated in two A. fistularis …
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Determination of Extractables from Cranberry Seeds Using Supercritical CO₂
… SF CO₂, which were derivatized and identified by gas chromatography mass spectrometry (GC-MS), contained mostly methylated fatty acids.
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Development Of Novel Analytical Methods For Detection And Determination Of Tamoxifen In Oral Fluid And Discrimination Between Regioisomeric Aromatase Inhibitors For Doping Control Purposes
<p>The use of SERMs (Selective Estrogen Receptor Modulators) – most notably the drug Tamoxifen – has significantly increased among athletes over the past decade to enhance athletic performance and/or negate certain side effects of using anabolic steroids. This “doping” is always banned by WADA …
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Chlorhexidine Interaction with Microcrystalline Cellulose
… toxicity and fiber degradation. This study aims to further analyze the breakdown products of chlorhexidine and sodium hypochlorite using Gas Chromatography-Mass Spectrometry (GC-MS) and High-Performance Liquid Chromatography (HPLC). By examining microcrystalline cellulose as a model, we will …
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Statistical Considerations in Designing for Biomarker Detection
… detection of biological agents using portable gas chromatography mass spectrometry (GC/MS) devices. Of particular interest is 2,6-pyridinedicarboxylic acid (dipicolinic acid, or DPA), a molecule that is present at high concentrations in spores of Clostridium and Bacillus, the latter of which …
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Method Development for the Synthesis of Anaerobic Digester Biogas with the Laboratory Environment
Biogas, a gaseous mixture produced during decomposition of organic matter, is a renewable, easily generated and common byproduct of anaerobic digestion at wastewater treatment plants (WWTP), landfills and agricultural operations. There is growing interest in researching and utilizing the energy …
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A Study of the Behavior of Chlorine and Organic Compounds During Combustion in an AFBC System
… The chlorine in coal may cause corrosion problems during utilization, if its concentration is high enough. The method for collection of the emissions of organic compounds involved the use of a Tenax resin as an absorbent for the organic compounds as they were emitted from the combustor. A …
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EXAMINATION OF VOLATILE ORGANIC COMPOUNDS ASSOCIATED WITH HUMAN DECOMPOSITION BYPRODUCTS IN SOIL
… samples were taken from an approximate center of mass from 32 known cadaveric decomposition islands (CDIs) at the Forensic Research Outdoor Station (FROST) in Marquette, MI, and analyzed using gas chromatography-mass spectrometry (GC-MS) headspace analysis. This study attempts to validate a …
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Chromatographic Studies Of Some Hormone And Metabolic Modulators Used For Doping In Sports
… simple, sensitive, rapid, and reliable gas chromatography- mass spectrometry (GC-MS) methods for the analysis of two hormone and metabolic modulators, toremifene and trimetazidine. Previously, there has been limited GC-MS methods used to analyze toremifene and trimetazidine. …
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Linking genetic regulation and the metabolic state
… and amino acid biosynthesis, using a standard Gas Chromatography Mass Spectrometry (GC-MS) platform optimized for this purpose.
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Analysis of Hopanoids From Three Psychrophilic Marine Bacterial Strains
… their primary alcohols. Preparative thin layer chromatography (TLC) was used to fractionate the treated extract. The treated hopanoids, recovered as TLC bands, were derivatized by acetylation, followed by gas chromatography/mass spectrometry (GC/MS) analysis. Lipid extracts from A. aceti yielded …
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Gas Chromatography: Mass Spectrometry of Chemical Agents and Related Interferents
One of the main problems encountered in chemical analysis operations in the field is collecting sufficient sample from the source and transferring that sample to the measurement instrument for fast separation and identification. I have been involved in developing a field-portable gas …
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Determination of Carbon Nanotube Modification by TG-MS and Pyrolysis-GC/MS
… was the goal of this project. The two evolved gas analysis (EGA) techniques used during this project were thermogravi me try-mass spectrometry (TG-MS) and pyrolysis-gas chromatography/mass spectrometry (GC/MS). Samples were heated while the gasses evolved were monitored to determine their …
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A Novel Phytoestrogen that Acts as an Agonist for Human Estrogen Receptors.
… of hormone-related diseases. Using Thin Layer Chromatography, gas chromatography/mass spectrometry (GC/MS), and proton nuclear nagnetic resonance (HNMR), I identified 4-ethoxymethylphenol (4EM) found in Maclura pomifera. While most phytoestrogens are heterocyclic compounds, 4EM is a simple …
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The Analysis of Flavor Compounds in Green Tea Using Ice Concentration Linked with Extractive Stirrer (Icecles)
… used to prepare green tea for flavor analysis by gas chromatography-mass spectrometry (GC-MS). ICECLES produce 301 constituents, the vast majority with stronger signal to noise ratios than the 245 components found using SBSE. Therefore, 56 extra constituents were detectable via ICECLES alone, …
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The Effect Of Conservation Treatments On Organic Residues In Archaeological Ceramics
… was quantified by organic extraction followed by gas chromatography-mass spectrometry (GC-MS) analysis. The results suggest that increasing the soaking time of a sherd in water decreases the amount of residue retained, and the addition of mechanical cleaning further reduces residue retention. The …
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Volatile Compounds in Vine Tea (Ampelopsis grossedentata)
… solid-phase micro-extraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS). Commercial vine teas samples were brewed with distilled water and Blacksburg (VA, USA) tap water and analyzed in triplicate. Vine tea infusions had acidic pH values and dark, reddish-yellow color. Type …
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Part One: A Flow Reactor With In-Line Analytics: Design and Implementation Part Two: In-Line Derivatization of Protic Compounds for GC/MS Reaction Monitoring
… of a flow reactor system complete with in-line gas chromatography mass spectrometry (GC/MS) analytical instrument is discussed. The testing and validation of the systems components was completed in order to create a fully automated chemical reaction system capable of running, analyzing and …
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