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 80 for “"gas chromatography GC."”.
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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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Využití technik hmotností spektrometrie v analýze přírodních látek
… to the theoretical part summarizes the analyzes gas chromatography (GC). Alkaloids have been classified according to their heterocyclic parts and the family Amaryllidaceae has been described. The work was based on professional texts by Czech and foreign authors. Used sources focused on the …
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The detection and characterisation of novel alkyl spin-adducts of PBN and its derivatives using capillary gas chromatography coupled to electron-ionisation mass spectrometry
… could be analysed via the combined techniques of gas chromatography (GC) and mass spectrometry (MS). The significant findings of this work involve trapping various radicals such as propyl radicals, 2-methyl propyl radicals, butanal radicals (oxoallylic radicals), 2-methyl butanal radicals and …
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Quantitative Determination of Acetylsalicyclic Acid and Acetaminophen by Q-NMR (Quantitative Nuclear Magnetic Resonance) Technique
… techniques such as High Performance Liquid Chromatography (HPLC) and Gas Chromatography (GC), to determine the quantity of the active ingredient and other material in the drugs. A large effort goes into developing methods using chromatography techniques. The method development and running …
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The use of model compounds to investigate the influence of fuel composition on the thermo-oxidative stability of fame/diesel blends
… and decalin. Fuel analysis was performed using gas chromatography (GC) with mass spectrometric (MS) and flame ionisation (FID) detection. Further analytical methods included Fourier transform infrared (FTIR) and ultraviolet-visible (UV-Vis) spectroscopy as well as electrospray ionisation-mass …
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Portable Micro-Gas Chromatography with Multidimensional Compound Identification Analysis
Gas Chromatography (GC) is an analytical technique in the chemistry field widely used to separate compounds present in a sample mixture. Conventional GC systems are an extremely versatile and powerful tool to perform complex separations. However, these systems come with the cost of being bulky and …
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Comparison of high performance liquid chromatographic, gas liquid chromatographic, and Saccharomyces uvarum methods for the determination of B{u2086} compounds
… pyridoxamine, and 4'-deoxypyridoxine. A gas chromatography (GC) equipped with a ⁶³Ni electron capture (EC) detector was used to separate the N-methyl-bis-trif luoroacetamide derivatives of the B₆ compounds on a l.54m x 2mm i.d. glass column packed with 10% SP2100 on Supelcoport 90-100 …
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Machine Learning for Structure-Agnostic Chemical Analysis from Chromatographic Data
Environmental monitoring relies heavily on gas chromatography (GC) to measure airborne contaminants such as volatile organic compounds (VOCs), yet many detected compounds lack structural or spectral references, limiting identification, property estimation, and quantitative analysis. This thesis …
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Microfluidic Columns with Nanotechnology-Enabled Stationary Phases for Gas Chromatography
… in a wide variety of applications. A benchtop gas chromatography (GC) system is considered a gold standard for chemical analysis by analytical chemists. Similarly, miniaturization of key GC components (preconcentrator, separation column, detector, and pumps) using micro- and nanotechnology …
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Mixing performance of a novel, continuous confined impinging jets mixer using competitive reactions
… final solution was experimentally determined by gas chromatography (GC) to determine the mixing efficiency: higher ethanol concentrations implied poorer mixing. In all experiments, the volumetric flow rate of sodium hydroxide solution was always kept the same, while the flow rate of the other …
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Changes in Aromatic Chemistry and Sensory Quality of Milk Due to Light Wavelength
Gas chromatography (GC) and gas chromatography olfactometry (GCO) was used to determine the effect of specific light wavelengths on light oxidation in milk. The most damaging wavelengths to milk quality appear to be the UV (200-400 and 395 nm) and short visible (463 nm) wavelengths. However, …
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Machine Learning Classification of Gas Chromatography Data
Gas Chromatography (GC) is a technique for separating volatile compounds by relying on adherence differences in the chemical components of the compound. As conditions within the GC are changed, components of the mixture elute at different times. Sensors measure the elution and produce data which …
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Sensory and chemical characteristics of lamb, mutton and mechanically deboned turkey meat patties
… measurement of headspace volatiles by gas chromatography (GC);Film type and storage time in the first experiment showed a highly significant effect on thiobarbituric acid (TBA) values in the refrigeration and/or frozen treatments. Vacuum packaging and frozen storage increased shelf life …
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Semi-Packed Micro Gas Chromatography Columns
Separation of complex gaseous mixtures using gas chromatography (GC) is an important step in analytical systems for environmental monitoring, medical diagnosis, and forensic science. Due to its high resolving power, analysis speed, and small sample size, GC, has become the premier technique for …
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Modular GC: A Fully Integrated Micro Gas Chromatography System
Gas Chromatography (GC) is one of the most important and widely used tools in analytical chemistry. However, they are bulky, have a longer measurement cycle, and consume a high amount of power. Micro-Gas Chromatography (µGC) is portable and energy-efficient, which allows onsite, real-time …
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Analysis of Biogenic Amines by GC/FID and GC/MS
… Amines in general are difficult to analyze by Gas Chromatography (GC) due to their lack of volatility and their interaction with the GC column, often leading to significant tailing and poor reproducibility. Biogenic amines need to be derivatized before both GC and HPLC analyses. The objective …
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The ring-opening polymerization of cyclosiloxanes in the presence of bis ([alpha], [omega]-aminopropyl)-1,3-tetramethyldisiloxane
… use of reversed-phase high performance liquid chromatography (HPLC) and capillary gas chromatography (GC) allowed the disappearance of the starting materials to be monitored as a function of reaction temperature, time, targeted molecular weight, catalyst type and concentration. Due to …
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The effect of membrane lipid hydrogenation on drug metabolising activity
… The extent of hydrogenation was determined using gas chromatography (GC). GC traces of linoleic acid samples showed evidence of hydrogenation occurring through the presence of saturated forms namely oleate and stearate. The GC trace of PC revealed that hydrogenation took place with longer chained …
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Development of gas chromatography/mass spectrometry analysis of urinary acylcarnitines : application to metabolism studies
… compounds which makes them unsuitable for direct gas chromatography (GC) and combined gas chromatography/mass spectrometry (GCIMS). The latter of these is the favoured technique for normal urinary organic acid assays and is ideal in terms of selectivity and sensitivity. The work reported here …
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The importance of long chain polyunsaturated fatty acids for fetal immune system maturation and function
… membrane fatty acid content was examined by gas chromatography (GC), and immunological profiles as defined by flow cytometry were compared between healthy term, preterm and DNI neonates as an indicator of immune deficiencies. This was the first study to examine the lipid profile of …
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