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Distribution behavior of some drug enantiomers in an aqueous two-phase system using counter-current extraction with protein

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Summary

The partial resolution of some drug enantiomers by counter-current extraction in an aqueous two-phase system using bovine serum albumin (BSA) or ovomucoid (OVM) as chiral discriminator is described. The phase system was prepared with dextran 40, polyethylene glycol and a protein. Ofloxacin (OFLX) enantiomer was well recognized by the BSA system, whereas the enantiomers of carvedilol (β-blocker) and DG-5128 (a new oral hypoglycaemic drug) were hardly recognized by the OVM system. The distribution coefficients of (S)-, (R)- and rac-OFLX varied with pH. Good enantioselectivity for OFLX was obtained at relatively high pH (≥ pH 9). The crude optically enriched OFLX enantiomers were extracted from the aqueous fractions and finally purified by thin-layer chromatography.

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Authors and Affiliations

  1. Analytical Research Center, Production Technology Research Laboratories, Daiichi Pharmaceutical Co., Ltd., 1-16-13 Kitakasai, Edogawa-ku, 134, Tokyo, Japan

    T. Arai & H. Kuroda

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  1. T. Arai
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  2. H. Kuroda
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Arai, T., Kuroda, H. Distribution behavior of some drug enantiomers in an aqueous two-phase system using counter-current extraction with protein. Chromatographia 32, 56–60 (1991). https://doi.org/10.1007/BF02262467

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  • DOI: https://doi.org/10.1007/BF02262467

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