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Titolo:
Electrocatalytic oxidation of NADH at polythionine-modified electrodes as studied by rotating disk voltammetry
Autore:
Wang, W; Komura, T; Yamaguchi, T; Takahashi, K;
Indirizzi:
Kanazawa Univ, Fac Engn, Dept Chem Mat, Kanazawa, Ishikawa 9200942, Japan Kanazawa Univ Kanazawa Ishikawa Japan 9200942 wa, Ishikawa 9200942, Japan
Titolo Testata:
ELECTROCHEMISTRY
fascicolo: 3, volume: 69, anno: 2001,
pagine: 165 - 170
SICI:
1344-3542(200103)69:3<165:EOONAP>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
REDUCED NICOTINAMIDE COENZYMES; ELECTROCHEMICAL OXIDATION; ADENINE-DINUCLEOTIDE; CARBON ELECTRODES; AQUEOUS-MEDIA; BLUE; ADSORPTION; BEHAVIOR; THIONINE;
Keywords:
polythionine film; NADH; electrooxidation; intermediate complex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, W Kanazawa Univ, Fac Engn, Dept Chem Mat, 40 Kodatsuno 2 Chome, Kanazawa, Ishikawa 9200942, Japan Kanazawa Univ 40 Kodatsuno 2 Chome Kanazawa Ishikawa Japan 9200942
Citazione:
W. Wang et al., "Electrocatalytic oxidation of NADH at polythionine-modified electrodes as studied by rotating disk voltammetry", ELECTROCH, 69(3), 2001, pp. 165-170

Abstract

The electrocatalytic oxidation of NADH at polythionine-modified electrodeswas studied by linear potential-sweep voltammetry, rotating disk voltammetry, and ultraviolet spectroscopy, The high overpotential of NADH was decreased by 0.5 V by modifying GC electrode with polythionine. The rate constantfor oxidation of NADH decreased with increasing NADH concentration in solution at each, pH values, indicating that the electrooxidation of NADH occurs via a intermediate complex [NADH-pTh]. The electrooxidation of NADH at a polythionine-modified electrode was limited by the rate of the conversion of the intermediate complex to NAD(+) and pTh. The rate constant for the dissociation of the intermediate complex decreased with decreasing pH value. This decrease may be due to a poor electron-donating property of NADH in an acidic solution or most probably to the great stability of protonated intermediate complex in an acidic solution.

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Documento generato il 10/04/20 alle ore 16:08:51