Poly-xanthurenic acid as an efficient mediator for the electrocatalytic oxidation of NADH

This paper describes, for the first time, the development of a simple and highly sensitive chemical sensor based on a new electroactive material, electrogenerated in situ from xanthurenic acid on an electrode modified with MWCNT. The modified electrode shows efficient electrocatalytic oxidation acti...

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Bibliographic Details
Published in:Electrochemistry communications 2010-03, Vol.12 (3), p.450-454
Main Authors: de Assis dos Santos Silva, Francisco, Lopes, Cleylton Bezerra, de Oliveira Costa, Erivaldo, Lima, Phabyanno Rodrigues, Kubota, Lauro Tatsuo, Goulart, Marília Oliveira Fonseca
Format: Article
Language:English
Subjects:
Biological and medical sciences
Biosensors
Biotechnology
Chemically modified electrodes
Chemistry
Electrocatalysis
Electrochemistry
Electrodes: preparations and properties
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
General and physical chemistry
Methods. Procedures. Technologies
MWCNT
NADH
Other electrodes
Various methods and equipments
Xanthurenic acid
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Summary:This paper describes, for the first time, the development of a simple and highly sensitive chemical sensor based on a new electroactive material, electrogenerated in situ from xanthurenic acid on an electrode modified with MWCNT. The modified electrode shows efficient electrocatalytic oxidation activity towards NADH at an applied potential of 0.1 V vs. Ag/AgCl. The kinetic constant, k kin, for the electrocatalytic oxidation of NADH, evaluated by chronoamperometry and voltammetry using RDE, provided values close to 10 5 mol −1 L s −1.
ISSN:1388-2481
1873-1902
DOI:10.1016/j.elecom.2010.01.017