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Photoelectrocatalytic Oxidation of NADH at a Graphite Electrode Modified with a New Polymeric Phenothiazine

Gligor, Delia; Dilgin, Yusuf; Popescu, Ionel Catalin and Gorton, Lo LU (2009) 12th International Conference on Electroanalysis In Electroanalysis 21(3-5). p.360-367
Abstract
A new approach for photoelectrocatalytic oxidation of NADH is described, based on a graphite electrode (G) modified with a new phenothiazine derivative, polyphenothiazine formaldehyde (PPF). Electrochemical measurements reveal that G/PPF presents a quasireversible voltammetric response, corresponding to a 2e(-)/2H(+) transfer and that G/PPF modified electrodes show electrocatalytic activity for NADH oxidation. When the surface of the G/PPF modified electrode was irradiated with a light source (250 W Halogen lamp), a significant increase in the electrocatalytic current was observed. The second order electrocatalytic rate constant (k(obs,[NADH]=0) = 3.9 x 10(3) M-1 s(-1), pH 7.0) was calculated from rotating disk electrode experiments,... (More)
A new approach for photoelectrocatalytic oxidation of NADH is described, based on a graphite electrode (G) modified with a new phenothiazine derivative, polyphenothiazine formaldehyde (PPF). Electrochemical measurements reveal that G/PPF presents a quasireversible voltammetric response, corresponding to a 2e(-)/2H(+) transfer and that G/PPF modified electrodes show electrocatalytic activity for NADH oxidation. When the surface of the G/PPF modified electrode was irradiated with a light source (250 W Halogen lamp), a significant increase in the electrocatalytic current was observed. The second order electrocatalytic rate constant (k(obs,[NADH]=0) = 3.9 x 10(3) M-1 s(-1), pH 7.0) was calculated from rotating disk electrode experiments, performed at various NADH concentrations. From amperometric measurements, it was noticed that, in the presence of light irradiation, the sensitivity of NADH detection (calculated as I-max/K-M ratio) increased ca. 3 times. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Modified, Phenothiazine derivative, NADH, Electrocatalytic oxidation, graphite electrodes
in
Electroanalysis
volume
21
issue
3-5
pages
360 - 367
publisher
John Wiley & Sons
conference name
12th International Conference on Electroanalysis
external identifiers
  • wos:000264063500018
  • scopus:60549108448
ISSN
1040-0397
DOI
10.1002/elan.200804397
language
English
LU publication?
yes
id
d1f7f9b5-2621-4102-8135-11d736f465f2 (old id 1404934)
date added to LUP
2009-06-10 15:40:54
date last changed
2017-04-02 03:49:28
@inproceedings{d1f7f9b5-2621-4102-8135-11d736f465f2,
  abstract     = {A new approach for photoelectrocatalytic oxidation of NADH is described, based on a graphite electrode (G) modified with a new phenothiazine derivative, polyphenothiazine formaldehyde (PPF). Electrochemical measurements reveal that G/PPF presents a quasireversible voltammetric response, corresponding to a 2e(-)/2H(+) transfer and that G/PPF modified electrodes show electrocatalytic activity for NADH oxidation. When the surface of the G/PPF modified electrode was irradiated with a light source (250 W Halogen lamp), a significant increase in the electrocatalytic current was observed. The second order electrocatalytic rate constant (k(obs,[NADH]=0) = 3.9 x 10(3) M-1 s(-1), pH 7.0) was calculated from rotating disk electrode experiments, performed at various NADH concentrations. From amperometric measurements, it was noticed that, in the presence of light irradiation, the sensitivity of NADH detection (calculated as I-max/K-M ratio) increased ca. 3 times.},
  author       = {Gligor, Delia and Dilgin, Yusuf and Popescu, Ionel Catalin and Gorton, Lo},
  booktitle    = {Electroanalysis},
  issn         = {1040-0397},
  keyword      = {Modified,Phenothiazine derivative,NADH,Electrocatalytic oxidation,graphite electrodes},
  language     = {eng},
  number       = {3-5},
  pages        = {360--367},
  publisher    = {John Wiley & Sons},
  title        = {Photoelectrocatalytic Oxidation of NADH at a Graphite Electrode Modified with a New Polymeric Phenothiazine},
  url          = {http://dx.doi.org/10.1002/elan.200804397},
  volume       = {21},
  year         = {2009},
}