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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 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
; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Modified, Phenothiazine derivative, NADH, Electrocatalytic oxidation, graphite electrodes
host publication
Electroanalysis
volume
21
issue
3-5
pages
360 - 367
publisher
John Wiley & Sons Inc.
conference name
12th International Conference on Electroanalysis
conference location
Prague, Czech Republic
conference dates
2008-06-16 - 2008-06-19
external identifiers
  • wos:000264063500018
  • scopus:60549108448
ISSN
1040-0397
DOI
10.1002/elan.200804397
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
d1f7f9b5-2621-4102-8135-11d736f465f2 (old id 1404934)
date added to LUP
2016-04-01 14:04:30
date last changed
2021-11-15 11:36:29
@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},
  language     = {eng},
  number       = {3-5},
  pages        = {360--367},
  publisher    = {John Wiley & Sons Inc.},
  title        = {Photoelectrocatalytic Oxidation of NADH at a Graphite Electrode Modified with a New Polymeric Phenothiazine},
  url          = {http://dx.doi.org/10.1002/elan.200804397},
  doi          = {10.1002/elan.200804397},
  volume       = {21},
  year         = {2009},
}