A novel electrochemical sensor for isocarbophos based on a glassy carbon electrode modified with electropolymerized molecularly imprinted terpolymer

• DOI: 10.1016/j.snb.2012.06.038
• Publication Date: 2012-06-27T08:56:33Z
• Authors: Xiaona Yan; Jian Deng; Jinsheng Xu; Hui Li; Lili Wang; Dan Chen; Jie Xie
• Keywords: Differential pulse voltammetry; Electrochemical gas sensor; Glassy carbon; Molecularly imprinted polymer

Abstract In this paper, a novel electrochemical sensor with sensitive and selective binding sites for isocarbophos (ICP) detection is reported, which is based on a glassy carbon electrode (GCE) modified with molecularly imprinted terpolymer of poly( o -phenylenediamine-co-gallic acid-co- m -aminobenzoic acid) (p(PD-GA-ABA)) templated with ICP. The surface feature of the p(PD-GA-ABA) modified GCE (MIP/GCE) was characterized by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). Several important parameters controlling the performance of the MIP/GCE were investigated and optimized. Under optimal conditions, the changes in DPV peak currents of the redox probe, hexacyanoferrate, were linear to ICP concentrations in the range from 7.50 × 10 −8 to 5.00 × 10 −5 M and 5.00 × 10 −5 to 1.00 × 10 −4 M, with the detection limit of 2.01 × 10 −8 M (S/N = 3). The method was applied successfully to determine ICP in cabbage and cowpea samples with satisfactory precision (2.30–5.28% of RSD) and acceptable recoveries (95.5–110.0%), demonstrating a promising feature for applying the MIP sensor to the measurement of ICP in real samples.