Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0956-5663(03)00133-7
Title: A high-performance glucose biosensor based on monomolecular layer of glucose oxidase covalently immobilised on indium-tin oxide surface
Authors: Fang, A. 
Ng, H.T.
Li, S.F.Y. 
Keywords: Electroreduction
Glucose biosensor
Hydrogen peroxide
Indium-tin oxide
Monolayer
Issue Date: 30-Oct-2003
Citation: Fang, A., Ng, H.T., Li, S.F.Y. (2003-10-30). A high-performance glucose biosensor based on monomolecular layer of glucose oxidase covalently immobilised on indium-tin oxide surface. Biosensors and Bioelectronics 19 (1) : 43-49. ScholarBank@NUS Repository. https://doi.org/10.1016/S0956-5663(03)00133-7
Abstract: In this paper, a mediatorless amperometric glucose biosensor based on direct covalent immobilisation of monomolecular layer of glucose oxidase (GOx) on a semiconducting indium-tin oxide (ITO) is demonstrated. The abundance of surface hydroxyl functional group of ITO allows it to be used as a suitable platform for direct covalent immobilisation of the enzyme for sensor architecture. The anodic current corresponding to electrochemical oxidation of the enzymatic product, hydrogen peroxide, at a sputtered Pt electrode at 0.500 V (vs. SCE) was obtained as the sensor signal. It was found that the biosensor based on the direct immobilisation scheme shows a fast biosensor response, minimum interference from other common metabolic species and ease of biosensor miniaturisation. A linear range of 0-10 mM of glucose was demonstrated, which exhibits a high sensitivity as far as performance per immobilised GOx molecule is concerned. A detection limit as low as 0.05 mM and long-term stability were observed. Even more important, the biosensor design allows fabrication through a dry process. These characteristics make it possible to achieve mass production of biosensor compatible with the current electronic integrated circuit manufacturing technologies. © 2003 Published by Elsevier Science B.V.
Source Title: Biosensors and Bioelectronics
URI: http://scholarbank.nus.edu.sg/handle/10635/75437
ISSN: 09565663
DOI: 10.1016/S0956-5663(03)00133-7
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