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Sensors 2003, 3(12), 544-554; doi:10.3390/s31200544

Direct Electrochemistry of Glucose Oxidase at a Gold Electrode Modified with Single-Wall Carbon Nanotubes

1,2 and 1,2,*
1 Department of Chemistry, Graduate School, University of Science and Technology of China, Beijing P. R. 100039, China 2 Department of Chemistry, Graduate School, Chinese Academy of Science, Beijing P. R. 100039, China
* Author to whom correspondence should be addressed.
Received: 8 August 2003 / Accepted: 15 November 2003 / Published: 31 December 2003
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The direct electrochemistry of glucose oxidase (GOD) was accomplished at a gold electrode modified with single-wall carbon nanotubes (SWNTs). A pair of welldefined redox peaks was obtained for GOD with the reduction peak potential at –0.465 V and a peak potential separation of 23 mV at pH 7.0. Both FT-IR spectra and the dependence of the reduction peak current on the scan rate revealed that GOD adsorbed onto the SWNT surfaces. The redox wave corresponds to the redox center of the flavin adenine dinucleotide(FAD) of the GOD adsorbate. The electron transfer rate of GOD redox reaction was greatly enhanced at the SWNT-modified electrode. The peak potential was shown to be pH dependent. Verified by spectral methods, the specific enzyme activity of GOD adsorbates at the SWNTs appears to be retained.
Keywords: Glucose oxidase ; SWNT-modified electrode; Direct Electrochemistry Glucose oxidase; SWNT-modified electrode; Direct Electrochemistry
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Liang, W.; Zhuobin, Y. Direct Electrochemistry of Glucose Oxidase at a Gold Electrode Modified with Single-Wall Carbon Nanotubes. Sensors 2003, 3, 544-554.

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