Stationary phases, gas chromatography

Poly crystalline silicon, 9 732 Poly [cyanopropylmethylf 14%)-dimethyl(86%)] siloxane, gas chromatography stationary phase, 4 617t... 

Baltazar, Q.Q., Leininger, S.K., and Anderson, J.L., Binary ionic liquid mixtures as gas chromatography stationary phases for improving the separation selectivity of alcohols and aromatics compounds, /. Chromatogr. A., 1182, 119-127, 2008. 

Anderson, J.L., and Armstrong, D.W., Immobilized ionic liquids as high-selectivity/high-temperature/high stability gas chromatography stationary phases. Anal. Chem., 77, 6453-6462,2005. 

OV-101 is a alkylpolysiloxane, a non-polar gas chromatography stationary phase, and C-20M a polyethylene glycol with a molecular weight of approximately 20,000 which is considered a polar gas chromatography stationary phase. 

There are growing numbers of reports indicating that chiral ionic liquids may be useful in many areas of science and technology, though synthesis and use of chiral ILs is in its infancy. For example, the use of ephedrinium-based chiral ILs (Fig. 5) as a gas chromatography stationary phase has been reported [12], Chiral ILs can be prepared either from chiral starting materials (Scheme lb) or using asymmetric synthesis (Scheme la) [13]. 

Gas Chromatography Stationary phase Amino Acid Derivatives Metal Chelates Cyclodextrin Derivatives... 

Some cyclodextrin derivatives used as chiral selectors in gas chromatography (Stationary phases commercially available on open tubular columns)... 

Source From Synthesis and properties of new cyclodextrin phenyl carbamates as capillary gas chromatography stationary phases, in Anal. Chim. Acta. ... 

Chiral compounds are frequently foimd among the flavor volatiles of fruits and, like many naturally occurring chiral compounds, one enantiomer usually exists with a greater preponderance when compared with its antipode. Chiral odor compounds may show qualitative and quantitative differences in their odor properties (7). For example, (/ )-(+)-limonene has an orange-like aroma while (5)-(-)-limonene is turpentine-like (5)-(+)-carvone is characteristic of caraway while its enantiomer has a spearmint odor (2). However, other chiral compounds, such as y 6-lactones, show very little enantioselectivity of odor perception (7). The occurrence of chiral flavor compounds in enantiomeric excess provides the analyst with a means of authenticating natural flavorings, essential oils, and other plant extracts. The advent of cyclodextrin-based gas chromatography stationary phases has resulted in considerable activity in the analysis of chiral compounds in flavor extracts of fruits, spices and other plants (i-7). 

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