Poly(aniline)-poly(acrylate) composite films as modified electrodes for the oxidation of NADH
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), 2599-2606. (doi: 10.1039/b001107j).
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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.
|Keywords:||nicotinamide adenine-dinucleotide, biofuel cell, polyaniline, morphology, deposition, mechanism|
Q Science > QD Chemistry
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
|Date Deposited:||05 Jan 2006|
|Last Modified:||01 Jun 2011 08:32|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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