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Direct electrochemistry and electrocatalysis of horseradish peroxidase in MnO2 nanosheet film

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  • Inorganic Chemistry
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Chinese Science Bulletin

Abstract

A novel material MnO2 nanosheet has been used as the support matrix for the immobilization of horseradish peroxidase (HRP). HRP entrapped in MnO2 nanosheet film exhibits facile direct electron transfer with the electron transfer rate constant of 6.86 s−1. The HRP/MnO2 nanosheet film gives a reversible redox couple with the apparent formal peak potential (E 0) of −0.315 V (vs. Ag/AgCl) in pH 6.5 phosphate buffer solution (PBS). The formal potential E 0 of HRP shifts linearly with pH with a slope of −53.75 mV · pH−1, denoting that an electron transfer accompanies single-proton transportation. The immobilized HRP shows an electrocatalytic activity to the reduction of H2O2. The response time of the biosensor for H2O2 is less than 3 s, and the detection limit is 0.21 μmol · L−1 based on signal/noise = 3.

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Authors and Affiliations

  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Han Xiao, JinLing Wu, Xu Chen & WenSheng Yang

Authors
  1. Han Xiao
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  2. JinLing Wu
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  3. Xu Chen
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  4. WenSheng Yang
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Corresponding author

Correspondence to WenSheng Yang.

Additional information

Supported by the National Natural Science Foundation of China (Grant No. 20301002) and the National 863 Program of China (Grant No. 2006AA03Z343)

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Xiao, H., Wu, J., Chen, X. et al. Direct electrochemistry and electrocatalysis of horseradish peroxidase in MnO2 nanosheet film. Chin. Sci. Bull. 53, 1152–1156 (2008). https://doi.org/10.1007/s11434-007-0490-8

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  • DOI: https://doi.org/10.1007/s11434-007-0490-8

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