Electropolymerized Molecular Imprinting & Graphene Modified Electrode for Detection of Melamine

A new method for the determination of melamine (MEL) indirectly by the changes of differential pulse voltammetry (DPV) current of K 3 [Fe(CN) 6 ] probes after 10 min incubation (∆I) has been established. It’s based on the inhibitory effect of MEL on occupying the molecular recognition sites of surface of the electropolymerized molecular imprinting & graphene modified glassy carbon electrode (MIPPy/GR/GCE). The MIPPy/GR/GCE was characterized by cyclic voltammetry (CV), electrochemical impedance spectrometry (EIS) and scanning electron microscopy (SEM). The ∆I is linearly proportional to the negative logarithmic concentration of MEL over the range of 3.0×10 -8 ~1.0×10 -4 mol•L -1 (R = 0.9948), the detection limit is 1.02×10 -8 mol•L -1 (S/N =3). The recoveries of samples are from102.65% to 108.02%, the result is satisfactory when it is used to analyze the real samples.