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Citation: SUN Yi-Xin, WANG Sheng-Fu. Electrochemical Behavior of Cytochrome c at L-Cysteine Self-assembled Membrane Electrode[J]. Chinese Journal of Applied Chemistry, ;2005, 22(3): 295-299. shu

Electrochemical Behavior of Cytochrome c at L-Cysteine Self-assembled Membrane Electrode

SUN Yi-Xin ,
WANG Sheng-Fu ^,

1.
College of Chemistry and Material Science, Hubei University, Wuhan 430062

Corresponding author: WANG Sheng-Fu,
Received Date: 10 May 2004
Available Online: 18 October 2004
Fund Project: 湖北省自然科学基金(2002AB047) (2002AB047)湖北省教育厅基金(2002A00018)资助项目 (2002A00018)

The electrochemical behavior of horse-heart cytochrome c(Cytc) adsorbed on L-cys/Au electrode surface was investigated by means of cyclic voltammetry,ac impedance and ultraviolet spectrometric measurements.The average adsorbance of Cytochrome c on the membrane electrode surface is 1.366×10^-10 mol/cm².Cytc immobilized on L-Cys/Au SAMs by electrostatic interaction maintains biological activity and electrochemical activity.The voltammetric peak current is in linear relation with the potential sweep rate at a low scan rate.Cyt showed a surface-controlled electrode process.The standard heterogeneous electron transfer rate constant calculated via ac impedence spectrum is 7.529×10^-4 cm/s.The adsorbed Cytc could electrocatalyze the reduction of hydrogen peroxide.The relationship between the catalytic current and H₂O₂ concentration exhibits a Michaelis-Menten kinetic mechanism for the electrocatalytic process and the constant K_m^app value was found to be 1.21×10^-3 mol/L.The cytochrome c adsorbed on L-Cys/Au SAMs exhibits a comparably high affinity for H₂O₂.
- cytochrome c,
- L-Cysteine,
- H₂O₂,
- gold electrode
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