β‐Methylumbelliferone Surface Modification and Permeability Investigations at PENTEL ™ Graphite Electrodes

Electrochemical and micro‐imaging analysis of a commercial graphite‐composite material is presented following electro‐oxidation with β‐methylumbelliferone. Charge‐transfer surface modification was observed for the graphite electrode, presumed to have arisen from adsorbed interfacial umbelliferone moieties. The molecular permeability of the new surface towards a range of similar, yet size‐variable (23 Å 3 –136 Å 3 ) molecular redox probes is...