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Abstract: A new molecular imprinted electrochemical sensor has been developed for detection of metolcarb (MTMC) by combination of graphene and gold nanoparticles. The molecularly imprinted polymer (MIP) was synthesized on the graphene and gold nanoparticles modified glassy carbon electrode surface by using MTMC as a template molecule, methyl acrylic acid as a functional monomer, and ethylene glycol maleic rosinate acrylate (EGMRA) as a cross-linker. The morphology of the sensing membrane was characterized by scanning electron microscope (SEM). The performance of the sensor was investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). A linear relationship between oxidation peak current of the probe and concentration of MTMC was obtained over a range from 1.0 × 10-7 to 1.0 × 10-4 mol/L (linear correlation coefficient = 0.9936) with a detection limit (S/N = 3) of 2.9 × 10-8 mol/L. The imprinted sensor was successfully used to determine MTMC in vegetable samples with recoveries ranging from 93.4% to 106.4%.
Template and target information: metolcarb, MTMC
Author keywords: Metolcarb, Graphene and gold nanoparticles, Molecularly imprinted electrochemical sensor, ethylene glycol maleic rosinate acrylate