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Reference type: Journal
Authors: Liu YT, Deng J, Xiao XL, Ding L, Yuan YL, Li H, Li XT, Yan XN, Wang LL
Article Title: Electrochemical sensor based on a poly(para-aminobenzoic acid) film modified glassy carbon electrode for the determination of melamine in milk.
Publication date: 2011
Journal: Electrochimica Acta
Volume: 56
Issue: (12)
Page numbers: 4595-4602.
DOI: 10.1016/j.electacta.2011.02.088
Alternative URL: http://www.sciencedirect.com/science/article/B6TG0-528YXBX-9/2/09ae9c28acd47515a99f75634aa7af60

Abstract: A novel and simple sensor is developed in this paper for melamine detection, which is based on an electropolymerized molecularly imprinted polymer (MIP) of para-aminobenzoic acid (pABA). The poly(para-aminobenzoic acid) (P-pABA) film was deposited in a pABA solution by potentiodynamic cycling of potential with and without the template (melamine) on a glassy carbon electrode. The surface feature of the modified electrode was characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The molecular imprinted sensor was tested by differential pulse voltammetry (DPV) to verify the changes in redox peak currents of hexacyanoferrate. Several important parameters controlling the performance of the P-pABA were investigated and optimized. In the optimal conditions, the relative redox peak currents of hexacyanoferrate were linear. The concentration of melamine ranged from 4.0 μM to 0.45 mM, with a linear correlation coefficient of 0.9992. The detection limit was 0.36 μM (S/N = 3). The MIP sensor was successfully applied to the determination of melamine in milk products and showed high selectivity, sensitivity, and reproducibility. The results of this research demonstrate that it is feasible to use the molecular imprinting methodology when preparing sensing devices for analytes that are electrochemically inactive
Template and target information: melamine
Author keywords: molecularly imprinted polymer, Poly(para-aminobenzoic acid), electropolymerization, Melamine, milk

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