Preparation of Carbaryl-imprinted Capillary Monolithic Column for Screening of Carbaryl from Three Carbamates Mixture

摘要

A carbaryl molecularly imprinted capillary monolith was prepared by organic-inorganic hybrid approach. Methacrylic acid (MAA) as functional monomer, γ-methacryloxypropytrimethoxysilane (γ-MAPS) as crosslinker, carbaryl as template molecule, and acetonitrile/dichloromethane mixture (v/v, 1:4) were used as porogen. The molar ratio of 1:6:8 (carbaryl:MAA: γ-MAPS, for which the retention factor k was 7.57, was expected to be highest for carbaryl on the optimum capillary monolith. The condition of 20 mmol/L phosphate buffer with pH value 3.5 containing 30% acetonitrile favored the carbaryl separation from three carbamates (carbaryl, fenobucarb and metocarb) through the effective imprinted length of the column which was 15 cm. As far as the screening of carbaryl from a group of structural analogs, the MIP monolith combined with capillary electrochromatography was preferred.