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NADH oxidation using carbonaceous electrodes modified with dibenzo-dithia-diazapentacene

Munteanu, Florentina LU ; Dicu, D; Popescu, I C and Gorton, Lo LU (2003) In Electroanalysis 15(5-6). p.383-391
Abstract
The electrochemical and the electrocatalytic behavior for NADH oxidation of a newly synthesized phenothiazine derivative, 16H,18H-dibenzo[c,1]-7,9-dithia-16,18-diazapentacene (DDDP), adsorbed on solid spectrographic graphite and on graphite powder or on zirconium phosphate (ZP), both entrapped in carbon paste, were compared. Experiments using cyclic voltammetry and a rotating disk electrode, performed in different experimental conditions (various pH values and NADH concentrations), showed that i) in the pH range between 4 and 8, the E°' value for DDDP adsorbed on ZP becomes pH independent; ii) in contrast to other redox mediators, adsorption of DDDP on ZP induced a significant negative shift of the E°' value; iii) the reaction rate for... (More)
The electrochemical and the electrocatalytic behavior for NADH oxidation of a newly synthesized phenothiazine derivative, 16H,18H-dibenzo[c,1]-7,9-dithia-16,18-diazapentacene (DDDP), adsorbed on solid spectrographic graphite and on graphite powder or on zirconium phosphate (ZP), both entrapped in carbon paste, were compared. Experiments using cyclic voltammetry and a rotating disk electrode, performed in different experimental conditions (various pH values and NADH concentrations), showed that i) in the pH range between 4 and 8, the E°' value for DDDP adsorbed on ZP becomes pH independent; ii) in contrast to other redox mediators, adsorption of DDDP on ZP induced a significant negative shift of the E°' value; iii) the reaction rate for electrocatalytic oxidation of NADH is markedly increased by adsorbing the mediator on ZP, being further improved by the presence of Ca2+ ions in the solution. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Electroanalysis
volume
15
issue
5-6
pages
383 - 391
publisher
John Wiley & Sons
external identifiers
  • wos:000182694800006
  • scopus:0037660194
ISSN
1040-0397
DOI
language
English
LU publication?
yes
id
4108eb22-b738-42d8-884b-6f63724f904f (old id 128936)
date added to LUP
2007-06-27 13:11:02
date last changed
2018-05-29 10:13:33
@article{4108eb22-b738-42d8-884b-6f63724f904f,
  abstract     = {The electrochemical and the electrocatalytic behavior for NADH oxidation of a newly synthesized phenothiazine derivative, 16H,18H-dibenzo[c,1]-7,9-dithia-16,18-diazapentacene (DDDP), adsorbed on solid spectrographic graphite and on graphite powder or on zirconium phosphate (ZP), both entrapped in carbon paste, were compared. Experiments using cyclic voltammetry and a rotating disk electrode, performed in different experimental conditions (various pH values and NADH concentrations), showed that i) in the pH range between 4 and 8, the E°' value for DDDP adsorbed on ZP becomes pH independent; ii) in contrast to other redox mediators, adsorption of DDDP on ZP induced a significant negative shift of the E°' value; iii) the reaction rate for electrocatalytic oxidation of NADH is markedly increased by adsorbing the mediator on ZP, being further improved by the presence of Ca2+ ions in the solution.},
  author       = {Munteanu, Florentina and Dicu, D and Popescu, I C and Gorton, Lo},
  issn         = {1040-0397},
  language     = {eng},
  number       = {5-6},
  pages        = {383--391},
  publisher    = {John Wiley & Sons},
  series       = {Electroanalysis},
  title        = {NADH oxidation using carbonaceous electrodes modified with dibenzo-dithia-diazapentacene},
  url          = {http://dx.doi.org/},
  volume       = {15},
  year         = {2003},
}