Preparation and application of isocarbophos sensor based on molecularly imprinting technique

YAN Xiao-na1,XU Jin-sheng2,WANG Li-li1,LI Xu-ting1,XIE Jie1,CHEN Dan1 and DENG Jian1(1.School of Chemistry and Chemical Engineering,University of South China,No.28,Hengyang,421001;2.Department of Chemistry and Materials Science,Hengyang Normal University,Hengyang,421001)  

In this paper,a non-conductive sensor is reported for the detection of isocarbophos which is based on a molecularly imprinted copolymer(MIP) of pGA-PD.The pGA-PD was electropolymerized on a glassy carbon electrode(GCE) with o-phenylenediamine(o-PD) and gallic acid(GA) as functional monomers and isocarbophos as template molecule via potentiodynamic cycling of potential in phosphate buffer solution(PBS).The performance of the MIP membrane was characterized by electrochemical impedance spectroscopy(EIS) and cyclic voltammetry(CV).Isocarbophos was measured by differential pulse voltammetry(DPV) through probe-K3Fe(CN)6 on the electrode.The results showed that,the peak currents were linear to the isocarbophos concentrations in the range from 2.00×10-7 to 2.00×10-4 mol/L,with the detection limit of 6.06×10-8 mol/L(S/N = 3) under the optimal conditions.Moreover,the MIP sensor was applied to the determination of isocarbophos in vegetables with the recoveries of 96.8%～104.0%.

【Key Words】： Molecular imprinted polymer Electropolymerization O-phenylenediamine Gallic acid Isocarbophos
【Fund】： 湖南省自然科学基金项目(10JJ3024);; 湖南省科技厅基金项目(2010FJ3020)资助
【CateGory Index】： O657.1;TP212.2

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