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Abstract: A novel and simple electrochemical sensor is developed for melamine detection which is based on the combination of self-assembled monolayers (SAMs) and the sol-gel process onto a gold electrode surface. SAMs were prepared by chemisorption of mercaptopropyltrimethoxysilane (MPTS) on the gold substrate serving as coupling agents for the deposition of a siloxane-based molecularly imprinted polymer top layer. The latter resulted from the hydrolysis and condensation of a mixture of alkoxysiloxanes in the presence of melamine. The performance of the imprinted siloxane film was characterized by cyclic and square wave voltammetry. Under the optimization conditions, the sensor showed a linear response range from 5.10-9 to 10-6 mol L-1 with a limit of detection (LOD) of 0.4 × 10-9 mol L-1. The measurements made in the presence of diaminomethyltriazine as an interfering molecule taken at the same concentration with melamine showed a very weak response compared to that of the template, hence the specificity of the sensor toward melamine
Template and target information: melamine
Author keywords: Melamine, self-assembled monolayers, Molecularly imprinted siloxane, electrochemical sensors