Enantioselective extraction of fenvaleric acid enantiomers by two-phase (W/O) recognition chiral extraction
作者:Jian Min Yi、Sai Jin Huang、Yu Ren Jiang、Ke Wen Tang
DOI:10.1007/s10847-010-9784-6
日期:2010.12
To establish an extraction method for fenvaleric acid (FA) enantiomers using l-iso-butyl-l-tartaric esters and hydroxypropyl-β-cyclodextrin (HP-β-CD) as chiral selector, the distribution of FA enantiomers was examined in methanol aqueous solution containing HP-β-CD and 1,2-dichloroethane organic solution containing l-iso-butyl-l-tartaric esters. The influences of the concentration of l-iso-butyl-l-tartaric esters and HP-β-CD, organic diluent, pH, extraction temperature and the concentration of methanol aqueous solution on the partition coefficient (k) and separation factor (α) of FA were investigated. The experiment results showed that the complex formed by l-iso-butyl-l-tartaric esters with S-enantiomer is stabler than that with R-enantiomer. With the increase of the concentration of l-iso-butyl-l-tartaric ester, k and α increased; With the increase of the concentration of HP-β-CD, k increased firstly, and then decreased, but α increased all the while, k was the highest when the concentration of HP-β-CD was 4 mmol L−1. 1,2-dichloroethane organic diluent was better than the others. With the increase of pH, k and α decreased; with further increasing concentration of methanol aqueous solution, k and α decreased, k and α were the highest when the concentration of methanol aqueous solution was 10%. The extraction temperature had a great influence on k and α, too.
为了建立以l-异丁基-l-酒石酸酯和羟丙基-β-环糊精(HP-β-CD)为手性选择剂的芬瓦里酸(FA)对映体的萃取方法,考察了FA对映体在含有HP-β-CD的甲醇水溶液和含有l-异丁基-l-酒石酸酯的1,2-二氯乙烷有机溶液中的分布。考察了l-异丁基酒石酸酯和HP-β-CD的浓度、有机稀释剂、pH值、萃取温度和甲醇水溶液浓度对FA的分配系数(k)和分离因子(α)的影响。实验结果表明,l-异丁基酒石酸酯与 S-对映体形成的复合物比与 R-对映体形成的复合物稳定。随着 l-iso-butyl-l-tartaric ester 浓度的增加,k 和 α 均增大;随着 HP-β-CD 浓度的增加,k 先增大后减小,但 α 一直增大,当 HP-β-CD 浓度为 4 mmol L-1 时,k 最大。1,2-二氯乙烷有机稀释剂的效果优于其他稀释剂。随着 pH 值的升高,k 和 α 下降;随着甲醇水溶液浓度的增加,k 和 α 下降,当甲醇水溶液浓度为 10%时,k 和 α 最高。萃取温度对 k 和 α 的影响也很大。