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A series of hyperbranched polycarbosilanes were synthesized and coated on the inner surface of fused-silica capillaries by chemical bonding. The end groups of the hyperbranched polycarbosilanes were modified with b-cyclodextrin derivatives. The chiral isomers of ofloxacin and chlorpheniramine were separated by this new type of chiral capillary electrophoresis column and high-column efficiency was achieved. The results showed that ofloxacin was completely separated at pH 3.0; the separation resolution was 2.32, and theoretical plates were greater than 4.5 Â 10 4 plates m À1 .

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