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Direct electron transfer of glucose oxidase on the carbon nanotube electrode

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Abstract

The direct electron transfer of glucose oxidase (GOx) immobilized onto the surface of the carbon nanotube (CNT)-modified glassy carbon (CNT/GC) electrode is reported. The direct electron transfer rate of GOx is greatly enhanced when it was immobilized onto the surface of CNT/GC electrode. Cyclic voltammetric results show a pair of well-defined and nearly symmetric redox peaks, which corresponds to the direct electron transfer of GOx, with the formal potential (E 0′), which is almost independent on the scan rates, of about −0.456 V (vs. SCE) in the phosphate buffer solution (pH 6.9). The apparent heterogeneous electron transfer rate constant (ks) of GOx at the CNT/GC electrode surface is estimated to be (1.74 ± 0.42) s-1, which is much higher than that reported previously. The dependence of E 0′ on solution pH indicates that the direct electron transfer of GOx is a two-electron-transfer coupled with two-proton-transfer reaction process. The experimental results also demonstrate that the immobilized GOx retains its bioelectrocatalytic activity toward the oxidation of glucose. The method presented here can be easily extended to obtain the direct electrochemistry of other enzymes or proteins.

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Authors and Affiliations

  1. Department of Chemistry, Nanjing Normal University, 210097, Nanjing, China

    Chenxin Cai, Jing Chen & Tianhong Lu

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  1. Chenxin Cai
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  2. Jing Chen
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Correspondence to Chenxin Cai.

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Cai, C., Chen, J. & Lu, T. Direct electron transfer of glucose oxidase on the carbon nanotube electrode. Sc. China Ser. B-Chem. 47, 113–119 (2004). https://doi.org/10.1360/03yb0148

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  • DOI: https://doi.org/10.1360/03yb0148

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