Low-level electrochemical detection of glucose oxidase and a glucose oxidase conjugate
An amperometric sensor for glucose oxidase is described. Partial optimization of the working electrode potential at 0·4 V vs. Ag/AgCl, 0·1 M KCl at a glucose concentration of 30 mM allows a low detection limit of 50 pM glucose oxidase within 25 min. The sensor exhibits a high degree of precision and...
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Veröffentlicht in: | Biosensors & bioelectronics 1995, Vol.10 (6), p.621-631 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | An amperometric sensor for glucose oxidase is described. Partial optimization of the working electrode potential at 0·4 V
vs. Ag/AgCl, 0·1 M KCl at a glucose concentration of 30 mM allows a low detection limit of 50 pM glucose oxidase within 25 min. The sensor exhibits a high degree of precision and reproducibility, and the same electrode may be re-used for many successive quantitative determinations. A mechanism for the sensor is proposed, in which hydrogen peroxide generated by glucose oxidase in bulk solution is oxidized at the working electrode, generating a current response that can be related to the glucose oxidase concentration. Conjugation of glucose oxidase with a coumarin-based pesticide analogue does not affect the amperometric response. |
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ISSN: | 0956-5663 1873-4235 |
DOI: | 10.1016/0956-5663(95)96938-U |