Electrochemical Evaluation of Binding Copper and Copper Histidine Complex on Histidine Modified Gold Electrode

Histidine monolayer was adsorbed on the surface of the gold electrode in aim to investigate electrochemical behavior of Cu2+ ion and Cu-His complex. Formation of the layer on the gold surface was investigated with cyclic voltammetry with p-benzoquinone/hydroquinone redox pair. Interaction between the modified electrode and Cu2+ and Cu-His was characterized with cyclic voltammetry and adsorptive anodic stripping voltammetry. Coupling of the Cu2+ and Cu-His onto the modified electrode was successfully done for a wide range of tested concentrations. Electrode response was linearly proportional to log c(Cu2+) and log c(Cu-His) with correlation coefficient R-2 = 0.9945 and R-2 = 0.9807 respectively.