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NADH electrooxidation using carbon paste electrodes modified with nitro-fluorenone derivatives immobilized on zirconium phosphate

Munteanu, Florentina LU ; Mano, N; Kuhn, A and Gorton, Lo LU (2004) In Journal of Electroanalytical Chemistry and Interfacial Electrochemistry 564. p.167-178
Abstract
The basic electrochemistry of carbon paste electrodes modified with two new redox mediators, nitro-fluorenone derivatives, one neutral and one negatively charged, adsorbed on zirconium phosphate has been studied as well as their ability to oxidize NADH electrocatalytically. Cyclic voltammetry of these chemically modified electrodes performed in different aqueous buffer solutions at different pHs revealed that the immobilized redox species present very stable redox properties and the formal potential is virtually independent of the pH and/or the constituents of the contacting solution. The second order rate constants for the electrocatalytic oxidation of NADH were evaluated from rotating disk electrode experiments, and found to be of the... (More)
The basic electrochemistry of carbon paste electrodes modified with two new redox mediators, nitro-fluorenone derivatives, one neutral and one negatively charged, adsorbed on zirconium phosphate has been studied as well as their ability to oxidize NADH electrocatalytically. Cyclic voltammetry of these chemically modified electrodes performed in different aqueous buffer solutions at different pHs revealed that the immobilized redox species present very stable redox properties and the formal potential is virtually independent of the pH and/or the constituents of the contacting solution. The second order rate constants for the electrocatalytic oxidation of NADH were evaluated from rotating disk electrode experiments, and found to be of the order of between 106 and 107 M−1 s−1, among the highest reported so far compared with literature values. The catalytic efficiency can be enhanced by addition of Ca2+ ions to the electrolyte solution and it is shown that Ca2+ affects both the neutral and negatively charged mediator. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Electroanalytical Chemistry and Interfacial Electrochemistry
volume
564
pages
167 - 178
publisher
Elsevier
external identifiers
  • wos:000220097900019
  • scopus:1342328145
ISSN
0022-0728
DOI
10.1016/j.jelechem.2003.10.034
language
English
LU publication?
yes
id
496a97f9-beed-418b-9f9a-6b527e6452d9 (old id 141289)
date added to LUP
2007-06-27 13:02:08
date last changed
2017-01-01 07:23:28
@article{496a97f9-beed-418b-9f9a-6b527e6452d9,
  abstract     = {The basic electrochemistry of carbon paste electrodes modified with two new redox mediators, nitro-fluorenone derivatives, one neutral and one negatively charged, adsorbed on zirconium phosphate has been studied as well as their ability to oxidize NADH electrocatalytically. Cyclic voltammetry of these chemically modified electrodes performed in different aqueous buffer solutions at different pHs revealed that the immobilized redox species present very stable redox properties and the formal potential is virtually independent of the pH and/or the constituents of the contacting solution. The second order rate constants for the electrocatalytic oxidation of NADH were evaluated from rotating disk electrode experiments, and found to be of the order of between 106 and 107 M−1 s−1, among the highest reported so far compared with literature values. The catalytic efficiency can be enhanced by addition of Ca2+ ions to the electrolyte solution and it is shown that Ca2+ affects both the neutral and negatively charged mediator.},
  author       = {Munteanu, Florentina and Mano, N and Kuhn, A and Gorton, Lo},
  issn         = {0022-0728},
  language     = {eng},
  pages        = {167--178},
  publisher    = {Elsevier},
  series       = {Journal of Electroanalytical Chemistry and Interfacial Electrochemistry},
  title        = {NADH electrooxidation using carbon paste electrodes modified with nitro-fluorenone derivatives immobilized on zirconium phosphate},
  url          = {http://dx.doi.org/10.1016/j.jelechem.2003.10.034},
  volume       = {564},
  year         = {2004},
}