Electrocatalytic response of dopamine at a DL-homocysteine self-assembled gold electrode

The gold electrode self-assembled with the homocysteine monolayer (Hcy/Au) is demonstrated to catalyze the electrochemical response of dopamine (DA) by cyclic voltammetry. A pair of well-defined redox waves was obtained and the calculated standard rate constant (k(s)) is 2.1 x 10(-2) cm/s at the self-assembled electrode. The reduction peak of DA can be used to determine the concentration of DA in presence of ascorbic acid (AA) owing to the Hcy/Au also catalyzing the electrochemical oxidation of AA. (C) 2000 Elsevier Science B.V. All rights reserved.Chemistry, AnalyticalSCI(E)50ARTICLE3277-2826