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Separation of ketoprofen enantiomers by extraction with L-n-butyl tartaric ester

Distribution behavior of ketoprofen enantiomers was examined in the methanol aqueous and organic solvent mixture containing L-n-butyl tartaric ester.The kinds of tartaric esters,the concentration of L-n-butyl tartaric ester and the methanol aqueous,the kinds of organic solvent on the distribution behavior were investigated.The results show that L-n-butyl tartaric ester form more stable diastereomeric complexes with S-enantiomer than that with R-enantiomer.The best enantioselectivity for ketoprofen enantiomers was in the separation system consisted of 0.20 mol/L L-n-butyl tartaric ester as chiral selector,1,2-dichloroethane as organic solvent and 10% methanol aqueous as solvent for ketoprofen.