Lateral visualization of direct electron transfer between microperoxidase and electrodes by means of scanning electrochemical microscopy

Lateral-resolved visualization of direct electron transfer between cystamine-monolayer modified planar gold electrodes with covalently bound microperoxidase MP-11 is possible using the feedback mode of scanning electrochemical microscopy (SECM). At a potential of the modified gold electrode of −500 mV versus Ag/AgCl the heme center of microperoxidase can be reduced by means of direct electrochemical communication, and a suitable redox mediator,...