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Abstract: A sensitive electrochemical sensor for promecarb was prepared based on molecularly imprinted strategy by thermal polymerization. The molecularly imprinted polymers (MIP) were synthesized by using promecarb as template molecule, acrylamide (AM) as functional monomer, ethylene glycol acrylate, maleic rosin ester (EGMRA) as a cross-linking, homemaking 3D graphene as sensitizing materials to modify glassy carbon electrode surface, and synthesize the promecarb molecular imprinting electrochemical sensor. 3D graphene was characterized by scanning electron microscopy (SEM). The properties of the sensor were tested via cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). The results showed that promecarb concentration in the range of 8.0 x 10-8 - 8.0 x 10-6 mol/L had a good linear relationship (linear correlation coefficient R=0.9954) with current, and the detection limit was 7.3 x 10-8 mol/L (S/N=3). The imprinted factor β of promecarb molecularly imprinted sensitive film was 3.88, the selection factor α was far greater than 1 compared to the three structural analogs. The imprinted sensor was successfully used to determine promecarb in lettuce samples with recoveries ranging from 96.7% to 98.7% by using standard addition method.
Template and target information: promecarb
Author keywords: Promecarb, Molecular imprinted electrochemical sensor, 3D-graphene