Influence of Tip Size on Single Yeast Cell Imaging Using Scanning Electrochemical Microscopy

The influence of the tip reaction on the substrate generation/tip collection mode SECM imaging of a single yeast cell was investigated by using various sizes of probe electrodes in mu m-nm scales because the tip reaction would disturb the concentration profile of intracellular enzyme reactant formed around the cell. GC mode measurements of a single yeast cell were performed using a dual mediator system with lipophilic menadione and hydrophilic ferricyanide. We found downscaling of the tip size enabled quantitative SECM imaging of a single cell in GC mode without disturbing the concentration profile of the mediator formed around the cell by the tip reaction.