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Reference type: Journal
Authors: Wu BW, Wang ZH, Zhao DX, Lu XQ
Article Title: A novel molecularly imprinted impedimetric sensor for melamine determination.
Publication date: 2012
Journal: Talanta
Volume: 101
Page numbers: 374-381.
DOI: 10.1016/j.talanta.2012.09.044
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0039914012008004

Abstract: A novel molecularly imprinted (MIP) impedimetric sensor was promoted for selective detecting melamine (MEL). The Au electrode modified with MIP poly (2-mercaptobenzimidazole) (PMBI) was prepared by electrochemical polymerization of 2-mercaptobenzimidazole (2-MBI) with cyclic voltammetry (CV) in the presence of template molecule MEL. The surface morphology and structure of MIP PMBI are characterized by atomic force microscopy (AFM), infrared spectra (IR), electrochemical impedance spectroscopy (EIS), and CV. The main driving force of recognition is the π-donor - acceptor interaction between MEL and PMBI. The imprinted electrode could avoid the interference successfully. In addition, a linear response curve was obtained from 1.0 x 10-8 M to 5.0 x 10-5 M, with the detection limit of 3.0 x 10-9 M. The sensor exhibits remarkable advantages, such as higher sensitivity, wider linear range and lower detection limit. The effective method has a potential application to monitor nonelectrochemically active substances in food analysis in the future
Template and target information: melamine, MEL
Author keywords: electrochemical impedance, molecularly imprinted, Melamine, 2-mercaptobenzimidazole


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