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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 87 for “"GC-MS analysis"”.
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Antioxidant Protection of an Omega-3 Fatty Acid Fortified Dairy-Based Beverage
… during storage for 35 days at 4 °C using GC/MS analysis, conjugated diene analysis, and headspace solid phase micro-extraction GC/MS (SPME-GC/MS) analysis of headspace. Omega-3 fatty acid fortified dairy-based beverages were produced that mimicked the physical properties of 3.25% fat whole …
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ΜΕΤΑΒΟΛΙΣΜΟΣ ΤΟΥ ΑΖΩΤΟΥ ΤΗΣ ΛΕΥΚΙΝΗΣ ΣΤΟ ΦΛΟΙΟ ΕΓΚΕΦΑΛΟΥ ΕΠΙΜΥΟΣ. ΠΕΙΡΑΜΑΤΑ ΜΕ 15Ν
… THEFREE AMINO-ACIDS WAS MEASURED BY COMBINED GC-MS ANALYSIS. THE ANALYSIS SHOWED INCORPORATION OF 15N DERIVED FORM 15N-LEU, PRIMARILY TO ILE. A METABOLIC COMPARTMENTALIZATION OF THE THREE BCAA, IN RAT BRAIN CORTEX, IS SUGGESTED.
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SOME CHEMICAL CONSTITUENTS OF THE BROWN ALGA, AGARUM CRIBOSUM AND THE EFFECT OF ELECTROSTATIC INTERACTIONS ON THE STEREOCHEMISTRY OF THE S(N)2' REACTION
… seaweed. The sterol content was determined by GC/MS analysis and six sterols were identified: fucosterol, 24-methylenecholesterol, cholesterol, 24-ketocholesterol, saringosterol, and desmosterol. The presence of desmosterol in brown algae had not been previously confirmed. A seventh sterol …
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Chromatographic and mass spectrometric characterization of a landfill leachate and an industrial wastewater
… and scientists in the design of treatment systems. Several extraction and analytical techniques were utilized for the analysis of components in complex environmental samples focusing on nonvolatile or thermally labile compounds. Of the extraction procedures evaluated, C₁₈ solid phase extraction …
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Incident-response monitoring technologies for aircraft-cabin air quality
… spectroscopy (EDS) and neutron activation analysis (NAA) were used for elemental analysis of filters, and gas chromatography interfaced with mass spectrometry (GC/MS) was used to analyze used filters to determine TCP isomers. The filter analysis study involved 110 used and 74 incident …
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Investigating the flavor of fresh calamondin peel and juice using instrumental and descriptive sensory analysis
… by gas chromatography-mass spectrometry (SPE-GC-MS) analysis was developed for volatile isolation and identification in calamondin juice and peel. The developed method used Lichrolut-EN sorbent and a 95:5 dichloromethane:methanol eluent that was effective for extraction of a wider range of …
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Measurement of lignin and organic carbon in Lake Mead sediment
… temperatures of 300°C followed by GC-MS analysis showed a great promise in being able to semi quantitatively assess the nature of organic carbon in sediments. TMAH chemopyrolysis produces methylated syringyl (S), vanillyl (V), and cinnamyl (C) phenols from lignin, these methylated …
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Determination of ground-water tracer 2,6-difluorobenzoic acid by Gc/Ms
In this study, a GC analytical method for the determination of the ground water tracer, 2,6-difluorobenzoic acid (2,6-DFBA) at the part per billion level was established. Three sample preparation methods, which include two methylation methods and one silylation method, have been evaluated. …
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Analysis of Hopanoids From Three Psychrophilic Marine Bacterial Strains
… by gas chromatography/mass spectrometry (GC/MS) analysis. Lipid extracts from A. aceti yielded three compounds with mass spectra characteristic of hopanoids. Psychrophilic strains 116-01, 80-0 and 12-02 tested negative for these compounds.
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Antimicrobial and antioxidant activity of crude extracts and fractions from stems and leaves of Tephrosia Lupinifolia
… and pharmacological studies conducted on the stems and leaves of the plant. The purpose of this study was to prepare and fractionate crude extracts from the leaves and stems of T. lupinifolia, and to evaluate their antioxidant as well as antimicrobial activities. Crude extracts were prepared by …
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Liquid chromatography-mass spectrometry, an evolution in doping analysis
Before the introduction of LC-MS in the field of doping analysis, mass spectrometrical information was acquired with capillary GC-MS. This analytical technique is only suitable for volatile compounds. Because doping agents include polar functional groups in their structure, their volatility is …
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The Effect Of Conservation Treatments On Organic Residues In Archaeological Ceramics
… 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 data gathered from this study can …
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In situ sintering study of model nickel catalysts
… such as gas chromatography mass spectroscopy (GCMS) and liquid chromatography mass spectroscopy (LC-MS) has become popular as metabolomics tools in the study of such catabolic pathways. The development of biomarkers and internal standards to perform quantitative and qualitative analysis of …
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Characterization of biofuel from diatoms via hydrothermal liquefaction
… lipid microalgae to produce bio-crude oil. Diatoms are a major group of microalgae in water bodies with a high growth rate and that contribute about 20% of global primary production. Their unique frustule (silica cell wall) results in a high ash content (39% dry weight). This character makes the …
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Synthesis and evaluation of flouro and thia lipids as bioanalytical tools
… such as gas chromatography mass spectroscopy (GCMS) and liquid chromatography mass spectroscopy (LC-MS) has become popular as metabolomics tools in the study of such catabolic pathways. The development of biomarkers and internal standards to perform quantitative and qualitative analysis of …
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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
… 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 optimizing a synthetic transformation …
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Single Liquid-Liquid Extraction of Delta-9-Tetrahydrocannabinol and 11-<i>Nor</i>-Carboxy-Delta-9-Tetrahydrocannabinol at an Acidic pH
… and recent usage. The laboratory preparation and analysis of delta-9-THC and delta-9-THCA in urine should be as cost and time efficient as possible. Current extraction of delta-9-THC and delta-9-THCA from urine requires two separate techniques for each. Because delta-9-THC is nonacidic, while …
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An On-line Test for Polycyclic Aromatic Hydrocarbons in the Flue Gas from Coal Combustion in an FBC System
… atmosphere by way of combustion processes. Thus, analysis of these compounds during coal combustion is an important task. Three 1000-hour coal combustion burns were performed using the 0.1 MW (0.3 m) bench-scale Fluidized Bed Combustor (FBC) in the Combustion Laboratory at Western Kentucky …
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Bioanalytical methods for studies of homocysteine and novel cardiovascular disease indicators
… hybrid organic-immunoaffinity extraction for GC-MS analysis of polycyclic aromatic hydrocarbons in human heart plaque samples. This body of work is significant because it proposes new bioanalytical technologies that could enhance CVD screening and treatment.
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Isolation and Identification of Biphenyl and Polychlorinated Biphenyl Degrading Microbes
… While typically recalcitrant to most forms of environmental degradation, biphenyl and PCBs compounds are known to share a common microbial degradation pathway with other chlorinated aromatics such as polychlorinated dioxin (PCDD) and dibenzofuran (PCDF). As such the purpose of this …
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