Abstract
ABSTRACTEnantiomers of 2-(4-hydroxyphenyl)propionic acid (HPPA) were successfully separated by high-speed counter-current chromatography (HSCCC) using hydroxyethyl-β-cyclodextrin (HE-β-CD) as chiral selector. Liquid–liquid extraction was applied to optimization of the two-phase solvent system used in HSCCC separation. A two-phase solvent system composed of isobutyl acetate and 0.1 mol L−1 phosphate buffer solution containing HE-β-CD (1:1, v/v) was selected. Factors affecting the distribution behavior of HPPA in the two-phase solvent system were studied separately, including pH of aqueous solution, concentration of HE-β-CD and equilibrium temperature. The optimum conditions containing pH of 2.50, 0.1 mol L−1 of HE-β-CD concentration, 5°C of temperature were obtained. Under the optimum conditions, 20 mg of HPPA enantiomers could be completely separated by HSCCC in a head-to-tail mode. Purities of the separated enantiomers were over 99.5% as determined by HPLC.
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