Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (2): 291-294.

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Direct Electrochemistry Transfer and Electrocatalysis of Hemoglobin Immobilized in Porous Mn2O3

SHI Lin-pu2 and GAO Qiu-ming1,2*   

  1. 1. School of Chemistry and Environment, Beihang University, Beijing 100191, P. R. China;
    2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China
  • Received:2010-09-16 Revised:2010-12-06 Online:2011-03-25 Published:2011-05-26
  • Contact: GAO Qiu-ming E-mail:qmgao@buaa.edu.cn
  • Supported by:

    Supported by the National Basic Research Program of China(No.2011CB935700) and the National Natural Science Foundation of China(No.U0734002).

Abstract: Novel porous Mn2O3 with good crystallinity was synthesized via hard-template method. Hb-Mn2O3 nanocomposite was prepared and used for biosensor construction. The Hb-Mn2O3-Nafion modified electrode shows fast direct electron transfer and displays good electrocatalytic response to the reduction of H2O2. The response time is less than 5 s, the sensitivity is as high as 493 μA·L·mmol–1·cm–2 in a linear range of 1—100 μmol/L, and the detection limit is 0.16 μmol/L. This modified electrode also shows good stability and reproducibility. This indicates that the porous Mn2O3 provides a good matrix for enzyme immobilization and biosensor construction.

Key words: Porous Mn2O3, Biosensor, Direct electrochemistry, Electrocatalysis, Hemoglobin