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Chemical modification of a nanocrystalline TiO2 film for efficient electric connection of glucose oxidase by Camila P. Sousa; André S. Polo; Roberto M. Torresi; Susana I. Córdoba de Torresi; Wendel A. Alves is a Chemistry article available to read on EtoBox.

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A novel biosensor for glucose was prepared by adsorption of 1,1'-bis(4-carboxybenzyl)-4,4'-bipyridinium di-bromide compound (H(2)BpybcBr(2)) onto the surface of a nanocrystalline TiO(2) film deposited onto FTO glasses, which was used as a platform to assemble the enzyme glucose oxidase to the electrode surface. The H(2)BpybcBr(2)/TiO(2)/FTO modified electrode was characterized by scanning electron microscopy, X-ray fluorescence image, cyclic voltammograms and spectroelectrochemical measurements. The immobilization of GOD on functionalized TiO(2) film led to stable amperometric biosensing for glucose with a linear range from 153 micromol L(-1) to 1.30 mmol L(-1) and a detection limit of 51 micromol L(-1). The apparent Michaelis-Menten constant (K(m)) was estimated to be 3.76 mmol L(-1), which suggested a high enzyme-substrate affinity. The maximum electrode sensitivity was 1.25 microA mmol L(-1). The study proved that the combination of viologen mediators with TiO(2) film retains the electrocatalytic activity of the enzyme, and also enhances the electron transfer process, and hence regenerating the enzyme in the reaction with glucose.

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Author

Camila P. Sousa; André S. Polo; Roberto M. Torresi; Susana I. Córdoba de Torresi; Wendel A. Alves

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

2010

Language

EN

Field

Chemistry (Physical Sciences)