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.
Results
Showing 1 to 11 of 11 for “"static headspace"”.
-
Analysis of the volatile components of heated esterified propoxylated glycerols
Static headspace (HS) and capillary gas chromatography/infrared spectroscopy-mass spectrometry (GC/IR-MS) were used to collect, separate, identify and quantitate the oxidative and thermal decomposition products in heated triolein, trilinolein and esterified propoxylated glycerols (EPGs), EPG-08 …
-
Taint and odour phenomena in carton-board packaging systems
… as 'rancid', 'pungent', 'soapy' and 'green'. Static headspace GC/MS analyses have identified a number of odorous compounds formed from oxidation reactions, within standard samples of wood pulp obtained from carton-board manufacturers. These oxidation reactions are affected to various extents, …
-
The Effect of Wine Matrix Ingredients on 3-Alkyl-2-methoxypyrazines Measurements by Headspace Solid-Phase Microextraction (HS-SPME)
… of wine matrix ingredients and conditions on the headspace (HS) sampling of 3-alkyl-2-methoxypyrazines was investigated with solid-phase microextraction (SPME) and capillary gas chromatography, using a nitrogen phosphorus detector. Changes in the recovery of 3-ethyl-, isopropyl-, sec-butyl-, and …
-
Greenhouse Gas Production and Nutrient Reductions in Denitrifying Bioreactors
… mass spectrometry was undertaken. Although static headspace analysis is a common technique for quantifying dissolved volatiles, the variation in sample preparation has recently been revealed to affect the determination of dissolved concentrations of permanent gases and convolute comparison …
-
Ionic Liquids in Micro Extractions and Gas Chromatographic Stationary Phases
… new horizon of applications.</p> <p>Ionic liquid–static headspace single drop micro extraction (IL-SHS SDME) involving three phase equilibrium was performed to extract aromatic hydrocarbons from water. A quick extraction was performed by taking the analyte in a 2 ml vial with o.5 ml headspace …
-
Determination of Henry's Law Constants of Odorous Contaminants and Their Application to Human Perception
… This research developed a simplified static-headspace technique to determine Henry's Law constants at multiple temperatures and then use these data to calculate the enthalpy of solution so that new Henry's Law constants can be calculated at any temperature using the van't Hoff …
-
Flavor chemistry of lemon-lime carbonated beverages
… carbonated beverages were quantified using static headspace solid phase microextraction (SPME) combined with stable isotope dilution assays (SIDA). The compounds chosen for quantification were 2,3-dehydro-1,8-cineole, 1,8-cineole, octanal, nonanal, decanal, linalool, borneol, isoborneol, …
-
Oxidative stability of Menhaden/Soybean oil blends
… 15 weeks at 22 C, in the dark, with air in the headspace. Peroxide Value (PV) was measured. The amounts of pentane and total volatiles produced were measured using the Shimadzu static headspace attachment for the Shimadzu GC-9A capillary gas chromatograph. Total volatiles also were followed …
-
Physicochemical and flavor characterization of Tupelo honey
… on the same ten samples as described above by static headspace solid phase microextraction (H-SPME). Of the 40 compounds detected, the most important compounds based on their perceived odor intensities determined by two assessors were phenylacetaldehye (rosy) and nonanal (citrus). Further …
-
Identification of key odorants in fresh-cut watermelon aroma and structure-odor relationships of cis,cis-3,6-nonadienal and ester analogs with cis,cis-3,6-nonadiene, cis-3-nonene and cis-6-nonene backbone structures
… a suitable volatile isolation strategy based on static headspace analysis (SHA). In this study, SHA was used to collect the headspace volatiles one minute after initial cutting of the fruit. This enabled a chemical “snap shot” of fresh-cut aroma to be taken. The most potent odorants in the …
-
Identification and characterization of potent odorants in selected beet root (Beta vulgaris) products
… extraction or co-eluted with ether during GCO, a static headspace technique for odor analysis was used. Decreasing volumes of headspace from gently heated canned beet mixtures were analyzed using GCO. Some compounds detected, such as geosmin and methional, were found in previous odor analyses. …