利用分子印迹传感器选择性测定绿麦隆

Preparing of a Molecularly Imprinted Sensor for Selective Determination of Chlortoluron

以绿麦隆为模板分子,邻氨基酚为功能单体,在金电极表面电聚合制得具有特异性识别孔穴的绿麦隆分子印迹膜。采用循环伏安、差分脉冲伏安法研究了印迹膜的性能、结构、分子印迹效应和模板分析物,并比较了传感器对其它结构相似化合物的选择性响应,发现该传感器对绿麦隆检测具有良好的选择性。绿麦隆浓度在3.0×10^-7-1.5×10^-6mol/L范围内与峰电流呈线性关系,检出限为1.0×10^-7mol/L,在干扰物质共存情况下的回收率为105%-116%。

A sensitive chlortoluron sensor based on molecularly imprinted electropolymer of o-aminophenol was proposed with chlortoluron as template molecule and o-aminophenol as functional monomers.The configuration and performance of molecular imprinted membrane and the voltammetric behaviour in molecular imprinted sensor were investigated by cyclic voltammetry（CV） and differential pulse voltammetry（DPV）.The sensor exhibited good selectivity and sensitivity to chlortoluron with the coexistence of interferences fluometuron and isoproturon,two of phenylurea herbicides with similar molecular structure to chlortoluron.A linear relationship between current and chlortoluron concentration was found in the range of 3.0×10^-7-1.5×10^-6 mol/L,the determination limit calculated through the formulation DL=3 δb/s was 1.0×10^-7 mol/L,and the recoveries of chlortoluron from the sample containing same concentration of fluometuron and isoproturon ranged from 105% to 116%.