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Titolo:
BIOELECTROCATALYSIS OF A WATER-SOLUBLE TETRATHIAFULVALENE 2-HYDROXYPROPYL-BETA-CYCLODEXTRIN COMPLEX
Autore:
ZHAO SS; LUONG JHT;
Indirizzi:
NATL RES COUNCIL CANADA,INST BIOTECHNOL RES MONTREAL H4P 2R2 PQ CANADA NATL RES COUNCIL CANADA,INST BIOTECHNOL RES MONTREAL H4P 2R2 PQ CANADA
Titolo Testata:
Analytica chimica acta
fascicolo: 2, volume: 282, anno: 1993,
pagine: 319 - 327
SICI:
0003-2670(1993)282:2<319:BOAWT2>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHEMICALLY MODIFIED ELECTRODES; ELECTROCHEMICAL-BEHAVIOR; AQUEOUS-MEDIA; OXIDATION; CHLORINATION; NADH;
Keywords:
BIOSENSORS; CYCLIC VOLTAMMETRY; BIOELECTROCATALYSIS; BETA-CYCLODEXTRINS; ELECTROOXIDATION; 2-HYDROXYPROPYL-BETA-CYCLODEXTRIN; TETRATHIAFULVAENE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
S.S. Zhao e J.H.T. Luong, "BIOELECTROCATALYSIS OF A WATER-SOLUBLE TETRATHIAFULVALENE 2-HYDROXYPROPYL-BETA-CYCLODEXTRIN COMPLEX", Analytica chimica acta, 282(2), 1993, pp. 319-327

Abstract

Water-soluble 2-hydroxypropyl-beta-cyclodextrin (hp-beta-CyD), a cyclic and non-reducing oligosaccharide, was used to enclose tetrathiafulvalene (TTF) to form a water-soluble complex. The molar ratio of hp-beta-CyD to TTF in TTF-saturated solutions was about 2.8 and the complex was much more stable than free TTF in aqueous solutions. The cyclic voltammogram of the TTF-hp-beta-CyD complex exhibited two oxidation waves with E(p) values of 210 mV (TTF --> TTF+.) and 415 mV (TTF+. --> TTF2+) at a glassy carbon electrode vs. Ag/AgCl. The former was relatively reversible and had a pH-independent E(p), while the latter was not reversible due to the decomposition of TTF2+ and had a strongly pH-dependent E(p). Application of this novel complex as a homogeneous mediator for the enzyme-catalyzed electrooxidation of glucose, hypoxanthine and lactate, respectively at a glassy carbon electrode was successfullydemonstrated. A well-defined catalytic wave was also obtained from NADH, illustrating the feasibility of the TTF-hp-beta-CyD complex for bioreactions involving NADH dehydrogenases. The complex for bioelectrocatalysis was then investigated at membrane electrodes of glucose oxidase and xanthine oxidase. Fast response, high sensitivity and a large range of linearity were observed.

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Documento generato il 25/11/20 alle ore 18:37:05