Theoretical and Experimental Study of the Homogeneous Catalytic Oxidation of Nicotinamide Adenine Dinucleotide (NADH) at Spherical Gold Electrodes Using Linear Sweep Voltammetry and Chronopotentiometry
✍ Scribed by Ángela Molina; Joaquín González; Manuela López-Tenés; Carmen M. Soto
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 440 KB
- Volume
- 21
- Category
- Article
- ISSN
- 1040-0397
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✦ Synopsis
Abstract
The homogeneous catalytic oxidation of coenzyme nicotinamide adenine dinucleotide (NADH) with dopamine at a thiolactic acid modified gold spherical electrode of radius 0.0128 cm has been studied in aqueous phosphate media (pH 7.0) using linear sweep voltammetry and chronopotentiometry with power time and exponential time currents. We have proved that, under the conditions of this study, the steady state is reached, in such a way that the expressions for the I−E and d__I__/d__E__−E responses are simplified and become independent of time and the electrochemical technique employed. Therefore, the experimental I−E and d__I__/d__E__−E curves obtained in chronopotentiometry and linear sweep voltammetry are practically superimposable and, from easy expressions for the peak parameters of the d__I__/d__E__−E curves deduced in this paper, values of the chemical and electrochemical rate constants have been obtained.