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Titolo:
Sources of instability of 'wired' enzyme anodes in serum: urate and transition metal ions
Autore:
Binyamin, G; Chen, T; Heller, A;
Indirizzi:
Univ Texas, Dept Chem Engn, Austin, TX 78712 USA Univ Texas Austin TX USA78712 exas, Dept Chem Engn, Austin, TX 78712 USA Univ Texas, Texas Mat Inst, Austin, TX 78712 USA Univ Texas Austin TX USA78712 exas, Texas Mat Inst, Austin, TX 78712 USA
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 500, anno: 2001,
pagine: 604 - 611
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-DIFFUSION COEFFICIENTS; GLUCOSE-OXIDASE; IMMOBILIZED ENZYMES; REDOX POLYMER; ASCORBIC-ACID; IN-VITRO; BIOSENSORS; QUATERNIZATION; INTERFERENCES; ELIMINATION;
Keywords:
glucose anodes; stability; serum; urate; electrooxidation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Binyamin, G Univ Texas, Dept Chem Engn, MC C0400, Austin, TX 78712 USA Univ Texas MC C0400 Austin TX USA 78712 , Austin, TX 78712 USA
Citazione:
G. Binyamin et al., "Sources of instability of 'wired' enzyme anodes in serum: urate and transition metal ions", J ELEC CHEM, 500(1-2), 2001, pp. 604-611

Abstract

The glucose electrooxidation currents of anodes with films of glucose oxidase and redox polymers electrically connecting ('wiring') its redox centersto electrodes decay much more rapidly in serum than in pH 7.2 saline phosphate buffer. Rapid decay is observed also in buffer in the presence of urate and transition metal ions, which are constituents of normal serum. Urate is electrooxidized to dimeric or trimeric products, which precipitate in the electrocatalytic film. Transition metal ions, like Zn2+ and Fe2+, coordinatively crosslink pyridine or imidazole functions of the redox polymers andalso inhibit glucose oxidase. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/04/20 alle ore 08:59:42