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Molecularly imprinted polymers (MIPs) for promazine (PZ) and chlorpromazine (CPZ), MIP PZ and MIP CPZ , were prepared by multi-step swelling and polymerization using methacrylic acid as a functional monomer and ethylene glycol dimethacrylate as a crosslinker. The retention and molecular-recognition properties of MIP PZ and MIP CPZ were evaluated using a mixture of potassium phosphate buffer and acetonitrile, or a mixture of ammonium formate and acetonitrile as the mobile phase in LC. PZ and CPZ gave the maximal retentions on MIP PZ and MIP CPZ at an apparent pH 8.2 using a mixture of potassium phosphate buffer and acetonitrile as the mobile phase. The retentions of PZ and CPZ decreased with an increase of acetonitrile contents from 70 to 90 vol% using a mixture of ammonium formate and acetonitrile as the mobile phase. The template molecules (PZ and CPZ, respectively) were recognized the most on the respective MIPs, and the imprinting factor of PZ was higher on MIP CPZ than on MIP PZ . These results indicate that in addition to shape recognition, ionic and hydrophobic interactions seem to work for the retention and molecular-recognition of PZ and CPZ on the MIPs. MIP CPZ was successfully utilized for the selective extraction of PZ in rat-serum samples in column-switching LC with fluorescence detection.

analytical sciences

Preparation and Evaluation of Molecularly Imprinted Polymers for Promazine and Chlorpromazine by Multi-step Swelling and Polymerization: the Application for the Determination of Promazine in Rat Serum by Column-switching LC