Electrocatalysis of emodin at multi-wall nanotubes

In this article, the electrochemical behavior of emodin at multi-wall carbon nanotube modified glassy carbon electrodes (MWNTs/GCE) was studied. The result showed that MWNTs/GCE had high electrocatalytic activity for emodin. And the electrocatalytic redox process was a two-charge-two-proton process. Diffusion coefficient (DR) of 8.403 × 10− 5 cm2 s− 1 of emodin was obtained. Further experiments demonstrated that the oxidative peaks increased linearly with emodin concentrations in the range of 1.0 × 10− 6 to 1.0 × 10− 4 M with a limit of detection of 3.0 × 10− 7 M. This electrochemical method was accurate and reliable, therefore, it might provide a novel way for emodin detection.