Electrochemical sensor based on molecularly imprinted polymer and graphene oxide nanocomposite for monitoring glyphosate content in corn

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 µA/μM and a stable linear range from 0 to 1800 μM. The sensor for GPh reached a low detection limit of 11 µM. 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.