Wasid Ullah Khan* and Zaheen Ullah Khan
In this work we developed a sensitive electrochemical magneto sensor based on modified magnetic molecularly imprinted polymer (MMIP) and magneto graphite-epoxy composite electrode (m-GEC) for sulfanilamide (SN) recognition. The sulfanilamide based magnetic molecularly imprinted polymer (MMIP) was first synthesized and then the surface feature of the core-shell MMIPs modified graphite-epoxy composite (mag-MIP/GEC) was characterized by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The response behavior of the mag-MIP/GEC electrode, known to affect was studied and optimized by various factors. The developed mag-MIP/GEC sensor shows high recognition ability and affinity for the template molecule with good sensitivity and stability. Under optimum experimental conditions, satisfactory linearity was observed between the current response of the redox probe and SN concentrations which range from 1.0 × 10-8 to 1.0 × 10-7 M, shown the detection limit of 3.0 ×10-9 M. The developed method was effectively applied to analyze SN in milk sample with satisfactory recoveries of 93.5 to 102.2%, representing an excellent characteristic of the mag-MIP/GEC as a sensor towards the recognition of SN in real samples.