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 44 for “"SPME-GC"”.
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Profiling and putative aroma biomarker identification for flavor in potatoes using a trained sensory panel and HS-SPME GC-MS
… chromatography coupled to mass spectrometry (HS-SPME GC-MS) facilitated identification of 42 unique metabolites with significant variation across samples (ANOVA, α=0.05, n=5 technical replicates x 14-15 clones x 2 cooking methods). Based on Spearman's rank correlations, hierarchical clustering …
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Effect of Foliar Nitrogen and Sulfur Applications on Aroma Profile of Vitis vinifera L. cv. Petit Manseng using Modified Quantitative Descriptive Analysis, SPME GC-MS and Electronic Nose Technology
… fractions. Solid phase microextraction (SPME) and gas chromatography-mass spectrometry (GC/MS) analysis identified 27 free aroma and flavor compounds and 52 bound compounds. Lactones and carboxylic acids were the major components of the free fractions while bound fractions had increased …
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Stanovení vonných látek s alergenními účinky
… organismus. V praktické části je využita metoda SPME-GC-FID ke stanovení vonných látek s alergenními účinky ve vybraných kosmetických přípravcích (přírodní krémy a toaletní vody).
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Advances in solid phase microextraction for the analysis of volatile compounds in explosives, tire treatments, and entomological specimens
… interest. The exceptional sensitivity of the SPME platform, combined with its adaptability to traditional GC-MS systems and its ability to extract samples with minimal work-up, make it appropriate to applications in forensic laboratories.</p> <p>In a series of research projects, solid phase …
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Advances in Solid Phase Microextraction for the Analysis of Volatile Compounds in Explosives, Tire Treatments, and Entomological Specimens
… interest. The exceptional sensitivity of the SPME platform, combined with its adaptability to traditional GC-MS systems and its ability to extract samples with minimal work-up, make it appropriate to applications in forensic laboratories. In a series of research projects, solid phase …
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The Development and Evaluation of Non-invasive Methods to Characterise the Disease States of Patients Utilising Selective Discrimination, Gas Chromatography-Mass Spectrometry and Chemometrics
… gas chromatography-mass spectrometry (GC-MS) and chemometrics. The primary analytical technique investigated was GC-Time-of-Flight-MS coupled with headspace solid-phase microextraction (HS-SPME-GC-ToFMS). A robust and sensitive method was developed by optimisation of all sample 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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Instrumental Methods for Determining Quality of Blue Crab (Callinectes sapidus) Meat
… gas chromatography-mass spectrometry (SPME-GC-MS). These techniques were compared to the more established techniques for determining quality of blue crab meat of sensory and microbiological analysis. Three different electronic nose methods were used to evaluate five sequentially spoiled …
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Formation, Characterization and Stability of Natural Antimicrobial-Cyclodextrin Complexes
… for 7 days in an acid-based beverage solution by SPME GC-MS. The complexes exhibited varying levels of degradation throughout the duration of the study all. The concentration of o-methoxycinnamaldehyde detected by SPME GC-MS decreased by 61.7%. Similarly, the concentration of …
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Investigating flavor quality and variances in F2 cucumber progenies using instrumental analysis
… the Folin Ciocalteu reaction (polyphenols), and SPME-GC-MS (volatiles). Statistical analysis included histograms and dendrograms constructed from AHC analysis. For texture, a normal distribution of hardness was observed with a range of 1.34N-57.26N and an average of 31.78N, while parents had a …
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C6 and C9 volatile compounds in 223 cucumbers (cucumis sativus L.) In Genome-Wide Association Studies (GWAS)
… gas chromatography-mass spectrometry (SPME-GC-MS). Hexenal (1.27–15.28 ppm) was the predominant volatile, followed by (E)-2-hexenal (0.21–7.83 ppm), (E)-2-nonenal (0.94-3.95 ppm), and (E,Z)-2,6-nonadienal (1.30-3.05 ppm). Out of 19 identified C6 and C9 compounds, a right-skewed …
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Senzoricky aktivní látky ječného sladu
… aktivních látek ječného sladu metodou HS-SPME-GC-MS. Byly analyzovány vzorky světlého sladu plzeňského typu, světlého karamelového sladu a barvicího čokoládového sladu, čtyř sladovnických odrůd ječmene – LG TOSCA, RGT PLANET, LG STAMGAST a BOJOS. Teoretická část práce je zaměřena na vznik …
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Senzorická kvalita francouzského plísňového sýra Brie de Meaux v souvislosti s jeho chemickým a mikrobiálním složením
… a při 20 °C. Vzorky byly hodnoceny pomocí SPME-GC-MS z pohledu těkavých (aromatických) látek. Mastné kyseliny byly identifikovány a kvantifikovány pomocí GC-FID po převedení na methylestery pomocí BF3. Pro mikrobiální profil byla využita metoda RT-PCR. Ve vzorcích bylo identifikováno 59 …
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Use of Extraction Technologies in Food Safety Studies
… extraction (ASE) and solid phase extraction (SPME), which are considered “green” sample preparation techniques, are among the most studied sample preparation techniques. They have advantages over traditional extraction methods, such as shortened extraction time, reduced solvent consumption, …
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Development of standardized dry roasting procedures for Virginia type peanuts
… roaster and tested for volatile analysis using SPME GC/MS with high variation observed within samples which may be caused by uneven roasting. The volatile results showed similar trends for seventeen compounds between normal and high oleic samples. The Behmor roaster was more effective at …
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Development of new tools for the agroindustrial effluent control : risk-hazard quantitation
… una fibra de micro-extracción en fase sólida (SPME) capaz de extraer un elevado número de sustancias; comprobar la capacidad del SPME junto con la cromatografía de gases y espectrofotometría de masas (GC/MS) como método de rastreo de contaminantes; y por último, poner a punto metodologías de …
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The influence of yeasts on the aroma of Stilton cheese
… Gas Chromatography-Mass Spectrometry (SPME GC-MS) and Principal Component Analysis (PCA). Sensory studies (Flash Profile, Napping®, Triangle, Paired Comparison and Constant Reference ranking tests) were conducted to determine whether findings were perceivable by humans.<br/><br/>The …
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Analysis and occurrence of disinfection by-products in fresh and salt water
… gas chromatography-mass spectrometry (SPME GC-MS) method was also developed for rapid trihalomethanes analysis. Screening occurrence studies of the DBPs in 34 Missouri drinking water treatment systems were conducted.The highly cytotoxic and genotoxic emerging HNMs were observed in most …
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Characterization of aroma and flavor compounds present in lambic (gueuze) beer
… objective of this research were (1) to compare SPME and SAFE for the isolation of flavor and aroma compounds, (2) determine the volatile composition and acids of commercially available lambic gueuze using SPME/GC-MS and HPLC, and (3) determine the major aroma compounds of aging lambic beer using …
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Efficacy of Odor Scavengers in Reducing Odor Compounds in Water, Milk, and Soymilk
… solid phase micro-extraction gas chromatography (SPME-GC) and sensory evaluation. Hexanal, 2-heptenal, 2-pentanone, and 2,4-nonadienal were spiked at 1,000, 3,000, 30,000, and 300 ppb respectively in all three media. Beta-cyclodextrin, D-sorbitol, and nylon 6 were added at a level of 0.1% w/v and …
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