Electrochemical behavior of rutin on a multi-walled carbon nanotube and ionic liquid composite film modified electrode

In this paper, the electrochemical behaviors of rutin at the MWNTs-IL-Gel/glassy carbon electrode (GCE) were investigated. Good electrocatalysis behavior towards the oxidation of rutin with enhancement of the redox peak current and decrease of the peak-to-peak separation was demonstrated. The electrochemical parameters of rutin were calculated giving values of the charge-transfer coefficient (α) and the electrode reaction standard rate constant (ks) as 0.47 and 0.2 s−1, respectively. In addition, the MWNTs-IL-Gel/GCE was characterized by different methods including electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), clay film thickness, and UV–vis spectra. The oxidation peak currents of rutin in such modified electrode increased linearly with the concentration of rutin in the range from 7.2 × 10−8 to 6.0 × 10−6 mol L−1 with a detection limit of 2.0 × 10−8 mol L−1. These results suggest that the proposed electrode can be used for sensitive, simple and rapid determination of rutin.