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Indophenol and o-quinone derivaties immobilized on zirconium phosphate for NADH electro-oxidation

Dicu, D; Munteanu, Florentina LU ; Popescu, I C and Gorton, Lo LU (2003) In Analytical Letters 36(9). p.1755-1779
Abstract
The electrocatalytic properties for NADH oxidation of five organic dyes, two indophenol derivatives (2,6-dichlorophenolindophenol and indophenol) and three o-quinone derivatives (phenanthrenequinone, pyrroloquinoline-quinone, and 1,2-naphthoquinone) were compared when adsorbed on zirconium phosphate entrapped in carbon paste. The electrochemical behavior of the immobilized dyes was investigated with cyclic voltammetry, performed in different aqueous buffers, at different potential scan rates and pH values. The electrocatalytic efficiency for NADH oxidation was evaluated from cyclic voltammetry, and the second order electrocatalytic rate constant was calculated from rotating disk electrode experiments, at various concentrations of NADH and... (More)
The electrocatalytic properties for NADH oxidation of five organic dyes, two indophenol derivatives (2,6-dichlorophenolindophenol and indophenol) and three o-quinone derivatives (phenanthrenequinone, pyrroloquinoline-quinone, and 1,2-naphthoquinone) were compared when adsorbed on zirconium phosphate entrapped in carbon paste. The electrochemical behavior of the immobilized dyes was investigated with cyclic voltammetry, performed in different aqueous buffers, at different potential scan rates and pH values. The electrocatalytic efficiency for NADH oxidation was evaluated from cyclic voltammetry, and the second order electrocatalytic rate constant was calculated from rotating disk electrode experiments, at various concentrations of NADH and pH values. These studies indicate that the mechanism of such electro-oxidation proceeds via the formation of an intermediate complex. A positive effect with the addition of Ca2+ cations to the solution was observed and the reaction rate for NADH oxidation increased. The highest second order rate constant was obtained for 2,6-dichlorophenolindophenol and found to be 4.6 × 106 M-1 s-1. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Analytical Letters
volume
36
issue
9
pages
1755 - 1779
publisher
Taylor & Francis
external identifiers
  • wos:000184660600007
  • scopus:0043063962
ISSN
0003-2719
DOI
language
English
LU publication?
yes
id
a016eb14-e3dd-4d93-b109-7fc5c1065732 (old id 128877)
date added to LUP
2007-06-26 14:05:40
date last changed
2018-05-29 11:08:36
@article{a016eb14-e3dd-4d93-b109-7fc5c1065732,
  abstract     = {The electrocatalytic properties for NADH oxidation of five organic dyes, two indophenol derivatives (2,6-dichlorophenolindophenol and indophenol) and three o-quinone derivatives (phenanthrenequinone, pyrroloquinoline-quinone, and 1,2-naphthoquinone) were compared when adsorbed on zirconium phosphate entrapped in carbon paste. The electrochemical behavior of the immobilized dyes was investigated with cyclic voltammetry, performed in different aqueous buffers, at different potential scan rates and pH values. The electrocatalytic efficiency for NADH oxidation was evaluated from cyclic voltammetry, and the second order electrocatalytic rate constant was calculated from rotating disk electrode experiments, at various concentrations of NADH and pH values. These studies indicate that the mechanism of such electro-oxidation proceeds via the formation of an intermediate complex. A positive effect with the addition of Ca2+ cations to the solution was observed and the reaction rate for NADH oxidation increased. The highest second order rate constant was obtained for 2,6-dichlorophenolindophenol and found to be 4.6 × 106 M-1 s-1.},
  author       = {Dicu, D and Munteanu, Florentina and Popescu, I C and Gorton, Lo},
  issn         = {0003-2719},
  language     = {eng},
  number       = {9},
  pages        = {1755--1779},
  publisher    = {Taylor & Francis},
  series       = {Analytical Letters},
  title        = {Indophenol and o-quinone derivaties immobilized on zirconium phosphate for NADH electro-oxidation},
  url          = {http://dx.doi.org/},
  volume       = {36},
  year         = {2003},
}