关键词: 3,4-二羟基苯甲酸, 2,4-二羟基苯甲酸, 分子印迹技术, 硅溶胶-凝胶分子印迹膜, 修饰电极

Abstract: The sol-gel molecularly imprinted films modified glassy carbon electrode was prepared by electrodeposition of tetramethoxysilane(TMOS) and phenyltrimethoxysilane(PTMOS) with chronoamperometry in the presence of template molecules 3,4-dihydroxybenzoic acid(3,4-DHBA) followed by extraction with ethanol.The modified electrode could successfully avoid the polymerization of oxidized 3,4-DHBA and the interference of 2,4-DHBA.A linear concentration response curve was obtained from 1.0 × 10-5 mol·L-1 to 8.0×10-4 mol·L-1,with the detected concentration limit of 5.0 × 10-6 mol·L-1.

Key words: 3,4-dihydroxybenzoic acid, 2,4-dihydroxybenzoic acid, molecular imprinted technique, silica sol-gel molecular imprinted films, modified electrode