Advanced

NADH electrocatalytic oxidation at glassy carbon paste electrodes modified with meldola blue adsorbed on acidic alpha-zirconium phosphate

Ladiu, Carmen Ioana; Garcia, Jose R.; Popescu, Ionel Catalin and Gorton, Lo LU (2007) In Revue Roumaine de Chimie 52(1-2). p.67-74
Abstract
The electrochemical behavior and the electrocatalytic activity for the NADH oxidation at glassy carbon paste electrodes (GCPEs) modified with Meldola Blue (MB) adsorbed onto acidic cc-zirconium phosphate (ZP*) have been investigated. Cyclic voltammetry and rotating disc electrode measurements, performed in Tris buffer solution (pH 7) in absence and in presence of different NADH concentrations, showed that: (i) the formal standard potential (E degrees') of NIB was found pH dependent, according to the equation E = E degrees (c)-0.059pH + 0.029log(1 + 10(pH-pKa)), where the best fitting value for pK(a) Was estimated to be 4.3 +/- 0.4; (ii) the best electrocatalytic response was obtained for MB-ZP*-modified GCPEs having a ratio between the... (More)
The electrochemical behavior and the electrocatalytic activity for the NADH oxidation at glassy carbon paste electrodes (GCPEs) modified with Meldola Blue (MB) adsorbed onto acidic cc-zirconium phosphate (ZP*) have been investigated. Cyclic voltammetry and rotating disc electrode measurements, performed in Tris buffer solution (pH 7) in absence and in presence of different NADH concentrations, showed that: (i) the formal standard potential (E degrees') of NIB was found pH dependent, according to the equation E = E degrees (c)-0.059pH + 0.029log(1 + 10(pH-pKa)), where the best fitting value for pK(a) Was estimated to be 4.3 +/- 0.4; (ii) the best electrocatalytic response was obtained for MB-ZP*-modified GCPEs having a ratio between the glassy carbon powder (Sigradur K) and MB-ZP* of 19:1; (iii) the presence of polyethyleneimine in the paste has a significant beneficial effect on the electrocatalytic activity of the investigated modified electrodes. As a general conclusion, it was stated that the particular features of the MB-ZP*-GCPEs are related to the ZP* crystallinity. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Revue Roumaine de Chimie
volume
52
issue
1-2
pages
67 - 74
publisher
Romanian Academy / Academia Române
external identifiers
  • wos:000247608100005
ISSN
0035-3930
language
English
LU publication?
yes
id
a6af08ca-9c85-48b2-9bd7-fe720150a33a (old id 647644)
date added to LUP
2007-12-13 18:23:15
date last changed
2016-04-16 04:40:38
@article{a6af08ca-9c85-48b2-9bd7-fe720150a33a,
  abstract     = {The electrochemical behavior and the electrocatalytic activity for the NADH oxidation at glassy carbon paste electrodes (GCPEs) modified with Meldola Blue (MB) adsorbed onto acidic cc-zirconium phosphate (ZP*) have been investigated. Cyclic voltammetry and rotating disc electrode measurements, performed in Tris buffer solution (pH 7) in absence and in presence of different NADH concentrations, showed that: (i) the formal standard potential (E degrees') of NIB was found pH dependent, according to the equation E = E degrees (c)-0.059pH + 0.029log(1 + 10(pH-pKa)), where the best fitting value for pK(a) Was estimated to be 4.3 +/- 0.4; (ii) the best electrocatalytic response was obtained for MB-ZP*-modified GCPEs having a ratio between the glassy carbon powder (Sigradur K) and MB-ZP* of 19:1; (iii) the presence of polyethyleneimine in the paste has a significant beneficial effect on the electrocatalytic activity of the investigated modified electrodes. As a general conclusion, it was stated that the particular features of the MB-ZP*-GCPEs are related to the ZP* crystallinity.},
  author       = {Ladiu, Carmen Ioana and Garcia, Jose R. and Popescu, Ionel Catalin and Gorton, Lo},
  issn         = {0035-3930},
  language     = {eng},
  number       = {1-2},
  pages        = {67--74},
  publisher    = {Romanian Academy / Academia Române},
  series       = {Revue Roumaine de Chimie},
  title        = {NADH electrocatalytic oxidation at glassy carbon paste electrodes modified with meldola blue adsorbed on acidic alpha-zirconium phosphate},
  volume       = {52},
  year         = {2007},
}