Reaction between L-cysteine and 10-methylphenothiazine cation radical released from droplet-modified electrodes

摘要

The electrochemical oxidation of 10-methylphenothiazine (PMe) dissolved in 1,2-trans-dibromocyclohexane oil droplets immobilised on a basal plane pyrolytic graphite (BPPG) electrode and bathed by an aqueous electrolyte is a one-electron quasi-reversible process which occurs with the expulsion of the electro-generated cation radical from the oil phase. In the presence Of L-cysteine in the aqueous phase, the electro-released cation mediates the redox catalytic oxidation of the thiol. The peak catalytic current is observed to increase linearly with increasing cysteine concentration over the range analysed (10100 mm). (C) 2008 Elsevier B.V. All rights reserved.