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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
; ; and
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 Inc.
external identifiers
  • wos:000182694800006
  • scopus:0037660194
ISSN
1040-0397
DOI
10.1002/elan.200390044
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Analytical Chemistry (S/LTH) (011001004)
id
4108eb22-b738-42d8-884b-6f63724f904f (old id 128936)
date added to LUP
2016-04-01 15:44:26
date last changed
2022-01-28 06:49:29
@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 Inc.}},
  series       = {{Electroanalysis}},
  title        = {{NADH oxidation using carbonaceous electrodes modified with dibenzo-dithia-diazapentacene}},
  url          = {{http://dx.doi.org/10.1002/elan.200390044}},
  doi          = {{10.1002/elan.200390044}},
  volume       = {{15}},
  year         = {{2003}},
}