The Electrochemistry Behaviour of Adsorption of BESOD on Mercury Electrode Surface

Abstract

Abstract: The electrochemical behaviour of bovine erythrocyte superoxide dismutase(BESOD)adsorbed On the mercury electrode surface was reported for the first time by cyclic voltammetry,direct current polarography and double potential-step chronoculoumetry without using mediator.The contribution of diffusion current predominated over adsorption current when the concentration of BESODwas more than 1.0×10^-4mol/L.The experimental adsorption isothermal line was in accordance with that calculated by Langmuir equation.The equilibrium constant of adsorptin was 8.96×10⁴ and Gibbs free energy was -28.2kJ/mol.The molecular area(18.06 nm²) of BESODobtained by the electrochemical method, is in good agreement with that(17.36 nm²determined by X-ray crystal structural analysis.

Key words: Cu, Zn-superoxide dismutase, Adsorption, Cyclic voltammetry.Double potential-step chronocoulometry

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QIAN Wen, MENG Qing-Guo, LUO Qin-Hui, SHEN Meng-Chang. The Electrochemistry Behaviour of Adsorption of BESOD on Mercury Electrode Surface[J]. Chem. J. Chinese Universities, 1996, 17(5): 687.

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The Electrochemistry Behaviour of Adsorption of BESOD on Mercury Electrode Surface

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