Abstract
Chemically bonded α- and β-cyclodextrin stationary phases were treated with acetic anhydride. The resulting acetylated stationary phases exhibit selectivity in the separation of disubstituted benzene isomers by liquid chromatography, as do the unmodified, parent cyclodextrin stationary phase. However, the acetylated β-cyclodextrin stationary phase is superior to the unmodified one and can completely separate the o-, m- and p-isomers of toluidine or dinitrobenzene, which cannot be done on the umnodified stationary phase. Acetylation of the α-cyclodextrin stationary phase does not necessarily bring about a similar improvement in the separation.
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