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

doi:10.3390/s31200544

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

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

Wang Liang ^1,2 and Yuan Zhuobin ^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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Abstract: 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

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MDPI and ACS Style

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

AMA Style

Liang W., Zhuobin Y. Direct Electrochemistry of Glucose Oxidase at a Gold Electrode Modified with Single-Wall Carbon Nanotubes. Sensors. 2003; 3(12):544-554.

Chicago/Turabian Style

Liang, Wang; Zhuobin, Yuan. 2003. "Direct Electrochemistry of Glucose Oxidase at a Gold Electrode Modified with Single-Wall Carbon Nanotubes." Sensors 3, no. 12: 544-554.

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