▎ 摘　　要

The current study has been focused on the preparation of an electrochemical sensor based on molecularly imprinted polymer and graphene oxide nanocomposite modified glassy carbon electrode (MIP@GO/GCE) for monitoring glyphosate (GPh) content in corn. The MIP-based nanocomposite was prepared through the polymerization of pyrrole on GO nanosheets. The structural studies of synthesized MIP-based nanocomposite by SEM and XRD analyses indicated effective polymerization PPy on the surface of GO. Electrochemical analyses demonstrated that MIP@GO/GCE showed the sensitive and selective electrocatalytic response to GPh in electrochemical cells, and indicated a sensitivity of 0.1271 mu A/mu M and a stable linear range from 0 to 1800 mu M. The sensor for GPh reached a low detection limit of 11 mu M. The results revealed that MIP@GO/GCE possessed the broad linear range and relatively low detection limit value between the recent GPh sensors. The applicability and validity of the MIP@GO/GCE as GPh sensor in food samples was examined and results exhibited that the obtained recovery (97.00% to 98.25%) and RSD (3.58% to 4.25%) values were acceptable. It reflected the appropriate accuracy and validity of results of MIP@GO/GCE for the determination of GPh level in food samples.