Preparation of Molecularly Imprinted Membrane for Type II-pyrethroid Determination Based on Electrochemical Technique
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Abstract:
Recently, increasing attention has been paid to the hazards of pyrethroid insecticide residues. Rapid detection techniques can provide technical support for monitoring the pyrethroid pesticide residues in agricultural products. Using o-aminophenol (OAP) as the functional monomer and 3-phenoxybenzoic acid (3-PBA) (the structural analog of type II-pyrethroid insecticides) as the template molecule, the electropolymerized molecularly imprinted membrane (MIM) was prepared for the detection of type II-pyrethroid insecticides; MIM was synthesized on the surface of glassy carbon electrode (GCE) by the method of cyclic voltammetry in this study. The prepared MIM was applied in the detection of type II-pyrethroid insecticides and responses to the insecticides were completed within five minutes. The changes in the peak current value showed a good linear correlation with deltamethrin, fenvalerate, fenpropathrin, and cyhalothrin within a certain concentration range; the corresponding correlation coefficients were 0.991, 0.992, 0.995, and 0.990, respectively; precisions were 2.20%, 2.80%, 2.50%, and 2.12%, respectively; and detection limits ranged from 0.01 mg/kg to 0.30 mg/kg. The system was used for measurements of spiked citrus samples such as tangerine, Gong orange, and Ponkan, and results showed high accuracy.
