Comparison of the Enantioselectivity of Β-Cyclodextrin vs.. Heptakis- 2,3-O-Dimethyl-Β-Cyclodextrin LC Stationary Phases

Abstract

The enantioselectivity of native β-cyclodextrin and its 2,3-methylated analogue were examined in both the 'polar-organic' mode and the reversed phase mode. By comparing these two chiral selectors, the function of the secondary 2,3-hydroxyl groups at the mouth of the cyclodextrin can be examined (in regard to selectivity and retention). In the 'polar-organic' mode, compounds that are easily resolved on the native β-cyclodextrin chiral stationary phase (CSP) cannot be resolved on the methylated CSP. These results, as well as the retention data, lend support to the previously proposed 'noninclusion' mechanism. In the reversed phase mode, many more compounds could be resolved on the native β-cyclodextrin CSP than on the methylated analogue. However, a few compounds were resolved only on the 2,3- methylated cyclodextrin CSP. In these cases, steric interactions at the mouth of the cyclodextrin cavity may be more important to chiral recognition than hydrogen bonding.

Department(s)

Chemistry

International Standard Serial Number (ISSN)

1082-6076

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Taylor and Francis Group; Taylor and Francis, All rights reserved.

Publication Date

01 Jan 1997

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