## Abstract A number of polysiloxanes have been shown to be sensitive to acids when dissolved in chloroform. At 26OยฐC polysiloxanes were found to degrade under the influence of several compounds used or produced during the preparation of glass capillary columns.
Chiral stationary phases for capillary gas chromatography: Towards higher selectivity and stability
โ Scribed by Frank, H.
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- English
- Weight
- 478 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0935-6304
No coin nor oath required. For personal study only.
โฆ Synopsis
Thermal stability and enantioselectivity of chiral polysiloxane staposition and purity of the polymer matrix, its functional groups, the chiral selector, and the pretreatment of the inner surface of the be prepared which may be used to 300 o c for short times. Crosslinking of the phases is achieved by heating. Chiral stationary phases for gas chromatography one of these phases known as Chirasil-Val has been Silicones with various chiral SekCtOrS have been synthesized and tested for gas chromatography [8-101 and, more tionary phases for gas chromatography depend upon the cornwere introduced about a decade ago [A, 21; the potential of capillary. Under proper conditions, narrow-bore capillaries can demonstrated in numerous applications e,g, refs. i3-71.
๐ SIMILAR VOLUMES
## Abstract In this paper, two new open crown ether polysiloxane stationary phases were prepared for capillary gas chromatography. Chromatographic characteristics, including column efficiency, operational temperature range, thermal stability, and polarity were studied. The open crown ether polysilo
New chiral stationary phases of polydimethylsiloxane anchored with (S)-(ร)-t-leucine derivatives were provided for use in enantiomer separation of pharmaceuticals by capillary gas chromatography. Fifteen pharmaceuticals were separated into their enantiomeric pairs by converting them into pentafluoro
## Abstract Polycarbonates were evaluated as stationary phases for capillary gas chromatography. Advantages of these resins are their high thermal stability and inertness to water. Long column lifetimes are exhibited for analysis of difficult samples such as acrylic acid in an acrylamide/water solu
## Heptakis(2,3-di-O-methyl-6-O-tert-butyldimethylsilyl)-~-cyclodextrin This chral stationary phase was described by A Dietrich,