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Poly(aniline)-poly(acrylate) composite films as modified electrodes for the oxidation of NADH

Record type: Article

Poly(aniline), electrochemically deposited on an electrode surface in the presence of poly(acrylic acid), forms a film which remains protonated, and conducting, at pH 7. The resulting modified electrode is an electrocatalytic surface for NADH oxidation at +0.05 V vs. SCE in 0.1 M citrate-phosphate buffer at pH 7. The amperometric responses of these composite poly(aniline) films for NADH oxidation were studied in detail and fitted to a kinetic model in which the NADH diffuses into the polymer film and then binds to catalytic sites within the film where it undergoes reduction to NAD(+). The rate determining process depends on the concentration of NADH present and the polymer film thickness. A comparison of the results presented here for the poly(aniline)-poly(acrylate) films with earlier work on poly(aniline)-poly(vinylsulfonate) films shows that the currents obtained for NADH at these poly(aniline)-poly(acrylate) films are approximately one third of those obtained for the poly(aniline)-poly(vinylsulfonate) films under similar conditions, that the currents saturate at lower NADH concentration and that the response is less stable towards repeated measurements. The poly(aniline)-poly(acrylate) films are, however, less readily inhibited by NAD(+) and possess the potential advantage that the carboxylate groups can be used as sites for chemical attachment of enzymes or NADH derivatives by using simple coupling reactions.

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Citation

Bartlett, P. N. and Simon, E. (2000) Poly(aniline)-poly(acrylate) composite films as modified electrodes for the oxidation of NADH Physical Chemistry Chemical Physics, 2, (11), pp. 2599-2606. (doi:10.1039/b001107j).

More information

Published date: 2000
Keywords: nicotinamide adenine-dinucleotide, biofuel cell, polyaniline, morphology, deposition, mechanism

Identifiers

Local EPrints ID: 18935
URI: http://eprints.soton.ac.uk/id/eprint/18935
ISSN: 1463-9076
PURE UUID: 93072714-8378-4c7d-8ebe-aa15126594e2
ORCID for P. N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900

Catalogue record

Date deposited: 05 Jan 2006
Last modified: 17 Jul 2017 16:34

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Contributors

Author: P. N. Bartlett ORCID iD
Author: E. Simon

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