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 1348 for “"GC"”.
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Analysis of Biogenic Amines by GC/FID and GC/MS
… 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 of this research was …
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Fast GC: Applications and Theoretical Studies
… of fast temperature programming in the fast GC analyses of various sample types. These samples included polycyclic aromatic hydrocarbons (PAHs), hydrocarbons and food samples. Programming rates of up to 1200° C/min were used. These fast programming rates were obtained by using "flash"â ¢ …
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Development and Application of An Integrated GC-MS/MS and GC-IRMS Analytical Approach in Food Quality Evaluation
… coupled with tandem mass spectrometry (GC-MS/MS) is widely used for the analysis of VOCs in plant extracts and essential oils. This highly sensitive and selective technique enables detailed compositional profiling of complex botanical matrices. Through chromatographic separation and mass …
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Μελέτη και ποσοτικοποίηση πολυκυκλικών αρωματικών υδρογονανθράκων με GC-MS
… μεθόδου προσδιορισμού αυτών των ενώσεων με GC-MS και αναλύθηκαν 20 δείγματα ελαιολάδων συλλεγμένα από ελαιοτριβείο στην Χαλκίδα. Σύμφωνα με τα αποτελέσματα όλα τα δείγματα ελαιολάδων κρίθηκαν ασφαλή και εντός των ορίων που θέτει η νομοθεσία. Το βένζο(a)ανθρακένιο προσδιορίστηκε σε όλα τα …
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Optimization of capillary GC/FTIR for complex sample analysis
… gas chromatography-Fourier Transform Infrared (GC-FTIR) spectrometry has been accomplished by studying various columns, lightpipe designs, FTIR detectors and spectroscopic parameters. For adequate separation of complex samples the efficiency of WCOT (Wall Coated Open Tubular) fused silica …
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Zebra GC: A Fully Integrated Micro Gas Chromatography System
… of microfabricated gas chromatography (microGC) system characterized for detecting hazardous air pollutants (HAPs) at parts-per-billion (ppb) concentrations in complex mixtures has been described. A microfabricated preconcentrator (microPC), a MEMS separation column with on-chip thermal …
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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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Detection and quantitation of diazinon and chlorpyrifos : a novel GC
… pathway. Solid phase extraction combined with GC/MS detection with selected ion monitoring was employed. In establishing calibration curves for GC/MS analysis, it may be impractical to use isotope-labeled analogs as internal standards for all analytes in a complicated matrix. Compounds may have …
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Probing Galactic Magnetism near the Galactic Center with THOR-GC
… Recombination Line Survey of the Milky Way (THOR-GC). THOR-GC covers the Galactic center, a complex region where the GMF is poorly understood. Polarization observations in THOR-GC can aid in uncovering the nature of the GMF in this region. As well, analysis of a highly polarized transient source …
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Analysis of Aroma Constituents in Cultivated Strawberries by GC/MS
… were separated by Gas Chromatography (GC), and identified by Mass Spectrometer Detector (MSD). Column and experimental conditions were optimized for this particular separation. Salinas, Orrville and Memphis strawberries have very similar aroma constituents, however, in slightly …
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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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Determination of Carbon Nanotube Modification by TG-MS and Pyrolysis-GC/MS
… pyrolysis-gas chromatography/mass spectrometry (GC/MS). Samples were heated while the gasses evolved were monitored to determine their identities. The soluble SWNTs were less stable than the non-soluble SWNTS. In addition, they also had much more complicated degradation schemes as evidenced by …
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Monitoring a natural autoxidation process of methyl linoleate by using GC-MS
… damage to living cells. The technology of GC-MS was employed to monitor the autoxidation of methyllinoleate.</p> <p>Eight of the autoxidation products separated by GC column were identified by interpreting the corresponding EI ion mass spectra. The products from 9-alkoxy methyl linoleate …
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Novel Preprocessing and Normalization Methods for Analysis of GC/LC-MS Data
… chromatography coupled with mass spectrometry (GC/LC-MS). Normalization is desired prior to subsequent statistical analysis to adjust variabilities in ion intensities that are not caused by biological differences. There are different sources of experimental bias including variabilities in sample …
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GC-TOF-MS basierte Analyse von niedermolekularen Primär- und Sekundärmetaboliten agrarwirtschaftlich bedeutsamer Nutzpflanzen
… an ein Flugzeitmassenspektrometer (GC-TOF-MS) gekoppelt, um physiologische Prozesse bzw. Eigenschaften (die Schwarzfleckigkeit, die Chipsbräunung, das Physiologische Alter und die Keimhemmung) von Nutzpflanzen aufzuklären. Als Pflanzenmodell wurde dafür die Kartoffelknolle verwendet. …
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