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Biocomposites of covalently linked glucose oxidase on carbon nanotubes for glucose biosensor

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Abstract

The formation of covalently linked composites of multi–walled carbon nanotubes (MWCNT) and glucose oxidase (GOD) with high-function density for use as a biosensing interface is described. The reaction intermediates and the final product were characterized by using FT–IR spectroscopy, and the MWCNT-coated GOD nanocomposites were examined by atomic force microscopy (AFM) and transmission electron microscopy (TEM). Interestingly, it was found that the GOD–MWCNT composites are highly water soluble. Electrochemical characterization of the GOD–MWCNT composites that were modified on a glassy carbon electrode shows that the covalently linked GOD retains its bioactivity and can specifically catalyze the oxidation of glucose. The oxidation current shows a linear dependence on the glucose concentration in the solution in the range of 0.5–40 mM with a detection limit of 30 μM and a detection sensitivity of 11.3 μA/mMcm2. The present method may provide a way to synthesize MWCNT related composites with other biomolecules and for the construction of enzymatic reaction-based biofuel cells and biosensors.

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Authors and Affiliations

  1. Key Laboratory of Analytical Chemistry for Life Science, Department of Chemistry, Nanjing University, Nanjing, 210093, PR China

    Jian Li, Yue-Bo Wang, Jian-Ding Qiu, Da-cheng Sun & Xing-Hua Xia

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  1. Jian Li
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  2. Yue-Bo Wang
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  3. Jian-Ding Qiu
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  4. Da-cheng Sun
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  5. Xing-Hua Xia
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Corresponding author

Correspondence to Xing-Hua Xia.

Additional information

Supported by grants from the National Natural Science Foundation of China (NSFC, No. 20125515; 90206037; 20375016) and the Natural Science Foundation of Jiangsu Province (Grant No. BK 2004210)

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Li, J., Wang, YB., Qiu, JD. et al. Biocomposites of covalently linked glucose oxidase on carbon nanotubes for glucose biosensor. Anal Bioanal Chem 383, 918–922 (2005). https://doi.org/10.1007/s00216-005-0106-6

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  • DOI: https://doi.org/10.1007/s00216-005-0106-6

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