Electrochemical Behavior of Esculetin on Glassy Carbon Electrode

Abstract

The electrochemical behavior of esculetin was investigated by cyclic voltammetry on glassy carbon electrode. The experimental conditions, such as supporting electrolyte and pH value, were tested for the electrochemical characterization of esculetin. It was shown that, in acetate buffer, the electrochemical behavior of esculetin had good reversibility. The average peak potential of esculetin was linearly correlative with pH value of acetate buffer, indicating that proton was involved in the electrochemical process of esculetin. Furthermore, the peak current of esculetin had linear relationship with the potential scan rate, showing that esculetin presented surface confined on glassy carbon electrode. It was observed that the cathodic peak currents were linear to the concentration of esculetin in range of 5.0 × 10-6 to 4.6 × 10-5 mol L-1 (r = 0.9994, n = 10) and the detection limit was 3.8 × 10-7 mol L-1.