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The effects of concentration and solution pH on the kinetic parameters for the electrocatalytic oxidation ofdihydronicotiamide adenine dinucleotide(NADH) at glassy carbon electrode modified with electropolymerized film of toluidine blue o

Authors
Journal
Microchemical Journal
0026-265X
Publisher
Elsevier
Publication Date
Volume
64
Issue
2
Identifiers
DOI: 10.1016/s0026-265x(99)00016-8
Keywords
  • Electrocatalysis
  • Chemically Modified Electrode
  • Mediator
  • Nadh
  • Toluidine Blue O
Disciplines
  • Chemistry

Abstract

Abstract The kinetic parameters for electrocatalytic oxidation of dihydronicotiamide adenine dinucleotide (NADH) at poly(toluidine blue o) (PTOB) modified glassy carbon electrode have been determined using rotating disk electrode measurements. The rate constant for the chemical reaction between NADH and PTOB was strongly influenced by NADH concentration and solution pH, and it decreased with increasing NADH concentration. It is indicated that the electrocatalytic process proceeded via the formation of an intermediate charge-transfer complex between NADH and PTOB. The presence of Mg 2+ and Ca 2+ in an electrolyte can greatly enhance the electrocatalytic current for NADH oxidation.

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