Enantioselective strong cation-exchange molecular recognition materials: design of novel chiral stationary phases and their application for enantioseparation of chiral bases by nonaqueous capillary electrochromatography |
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| Authors: | Constantin Stéphane Bicker Wolfgang Zarbl Elfriede Lämmerhofer Michael Lindner Wolfgang |
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| Affiliation: | Christian Doppler Laboratory for Molecular Recognition Materials, Institute of Analytical Chemistry, University of Vienna, Vienna, Austria. |
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| Abstract: | New chiral stationary phases derived from enantiomerically pure derivatives of cysteine carrying sulfonic acid groups are synthesized and evaluated for enantiomer separation of chiral bases by non aqueous capillary electrochromatography after bonding to a linker and grafting upon thiol-modified silica particles. Structural modifications of these low molecular weight chiral selectors are investigated and discussed in terms of apparent enantioselectivities and resolution factors based on the enantiomeric separations of a set of chiral bases including beta-blockers, beta-sympathomimetics and other basic drugs. The influence of the mobile phase constitution and its flow velocity on the enantioseparation by nonaqueous capillary electrochromatography is also briefly evaluated and discussed for the chiral substances investigated. |
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