Abstract
A new perstraction system using a charged membrane was developed in order to obtain high selectivity by liquid-liquid equilibrium and electrostatic rejection effects. A mixture of N- beenzyloxycarbonyl)- l-aspartic acid (ZA), l-phenylalanine methyl ester (PM) and N- (benzyloxycarbonyl)- l-phenylalanine methyl ester (ZAPM) was used as the model solution. The aqueous phase was adjusted to pH 6 and using a positively charged membrane, only ZAPM was extracted into the organic phase. The separations between ZA and ZAPM, and between PM and ZAPM were performed by bi-phasic extraction and electrostatic rejection, respectively. The utility of this hybrid separation system, combining perstraction with charged membrane separation is demonstrated.
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