Nano Archive

Electrochemical characteristics of glucose oxidase adsorbed at carbon nanotubes modified electrode with ionic liquid as binder

Liu, Ying and Liu, Ling and Dong, Shaojun (2006) Electrochemical characteristics of glucose oxidase adsorbed at carbon nanotubes modified electrode with ionic liquid as binder. ELECTROANALYSIS, 19 (1). pp. 55-59.

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Official URL: http://www3.interscience.wiley.com/journal/1135092...

Abstract

Multiwall carbon nanotubes (CNTs)-modified electrode has been prepared by using ionic liquid (IL) as the binder. The as-prepared CNTs-IL composite modified electrode has good biocompatibility and is a suitable matrix to immobilize biomolecules. Glucose oxidase (GOx), containing flavin adenine dinucleotide as active site, stably adsorbed on modified electrode surface has resulted in the direct electron transfer. The electron transfer rate of 9.08 s-1 obtained is much higher than that of GOx adsorbed on the CNTs papers (1.7 s-1), and the process is more reversible with small redox peak separation of 23 mV. This may be due to the synergetic promotion of CNTs and IL to electron transfer of the protein, especially the IL as the binder, showing better electrochemical properties than that of chitosan and Nafion. Furthermore, GOx adsorbed at the modified electrode exhibits good stability and keeps good electrocatalytic activity to glucose with broad linear range up to 20 mM. Besides, the simple preparation procedure and easy renewability make the system a basis to investigate the electron transfer kinetics and biocatalytic performance of GOx and provide a promising platform for the development of biosensors.

Item Type:Article
Uncontrolled Keywords:carbon nanotubes; ionic liquid; glucose oxidase; direct electron transfer; glucose; biosensor
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Physical Science > Nano objects
Biomedical Science > Nanotechnology for human health
ID Code:3181
Deposited By:Anuj Seth
Deposited On:26 May 2009 11:36
Last Modified:26 May 2009 11:36

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