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Electrochemistry of Microperoxidase-11(MP-11) on Glassy Carbon Electrode Modified with Chitosan

WANG Kun-Qi1,3,4, MA Zhong-Su1*, LU Tian-Hong3, XING Wei3, ZHU Lin3, LÜ Qiang1, XING Shen-Yang2   

    1. College of Biological & Agricultural Engineering, Jilin University, Changchun 130025, China;
    2. College of Animal Science and Veterinary Medicine, Jilin University, Changchun 130062, China;
    3. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
    4. School of Science, Changchun Institute of Technology, Changchun 130021, China
  • Received:2008-06-04 Revised:1900-01-01 Online:2009-03-10 Published:2009-03-10
  • Contact: MA Zhong-Su

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Abstract: In this paper, microperoxidase-11(MP-11) was immobilized on glassy carbon electrode surface modified with chitosan by physical adsorption. The direct electrochemistry and the electrocatalytic behaviours to O2 and the H2O2 of MP-11 on glassy carbon electrode modified with chitosan were characterized by cyclic voltammetry. The results indicate that MP-11 on modified electrode displays a quasi-reversible electrochemical process coupled with proton transfer in the phosphate buffer solutions(pH=7.12). Direct electrochemical reaction of MP-11 on modified electrode has been realized. MP-11 on modified electrode can catalyze reduction for O2 and H2O2. Both of the catalytic reductions are surface-controlled electrochemical process. The response current of MP-11 on modified electrode to H2O2 is linear with hydrogen peroxide concentration. In a word, the electrode modified by chitosan as a matrix material can be used in the biofuell cell and biosensor in the future.

Key words: Microperoxidase-11(MP-11), Chitosan, Electrocatalysis

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