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Abstract: A new molecular imprinted electrochemical sensor was developed for the detection of 3,5-xylyl methylcarbamate (XMC) by combination of graphene and gold nanoparticles. The molecularly imprinted polymer (MIP) was synthesized on the surface of grapheme and gold nanoparticles modified glassy carbon electrode by using XMC as template molecular, methyl acrylic acid (MAA) as functional monomer, and ethylene glycol maleic rosinate acrylate (EGMRA) as cross-linker. The morphology of the sensing membrane was characterized by scanning electron microscopy (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 and XMC concentration was obtained over the range of 1.0 x 10-7 - 2.0 x 10-5 mol L-1 with a correlation coefficient of 0.997 9 and a detection limit (S/N=3) of 1.5 x 10-8 mol L-1.The selectivity experiments showed that the imprinting factor (β) of XMC imprinted film was 2.94 and the selectivity factors (α) of XMC compared to interference were all larger than 1. Although a minor interference was generated by XMC for its structure similar to metolcarb, the selectivity factor also reached to 2.39. The results indicated that the imprinted polymer films exhibited an excellent selectivity for XMC. The kinetics of recognition suggested that the process of the imprinted polymer films adsorbing XMC is Langmuir model and its kinetic rate constant is 73.05 s. The imprinted sensor was successfully used to determine XMC in vegetable samples with recoveries of 95.4% -108.0% by using the standard addition method.
Template and target information: 3,5-xylyl methylcarbamate, XMC
Author keywords: 3,5-xylyl methylcarbamate, graphene doping gold nanoparticles, ethylene glycol maleic rosinate acrylate, Molecularly imprinted electrochemical sensor, selective recognition