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Studies on the Electrode Process thermodynamics of Cytochrome C at A Microband Gold Electrode Modified with4, 6-Dimethy1-2-mercaptopyrimidine

CAI Chen-Xin; JU Huang-Xian; CHEN Hong-Yuan(Department of Chemistry,Nanjing University,Nanjing, 210008)  
The redox thermodynamics of cytochrome C at a 4, 6-dimethyl-mercaptopyrimidine(DMMP), a new electron transfer promoter of cytochrome C, modified microband gold electrode(DMMP/Au)was investigated by cyclic voltammetry. The thermodynamic param eters of the electron-transfer reaction of cytochrome C at DMMP/Au electrode were estimated. The normal potential E0', the changes of entropy,enthalpy and Gibbs free energy,△S ̄0,△H ̄0 and △G ̄0, for cytochrome C at 25℃ and pH 7.0 were 0.272 V(vs. NHE),-123.7 J· mol ̄(-1)·K ̄(-1),-63.1 kJ·mol ̄(-1) and -26.2kJ·mol ̄(-1), respectively. The effects of temperature and pH on the thermodynamic parameters of cytochrome C were discussed. The E ̄0' vs.T plot shows remarkable biphasic character in an alkaline solution with a turning point at ca.45℃, whereas in an acid or neutral solution the E ̄0' values changed monotonically with temperature.
【Fund】: 国家自然科学基金 国家教育委员会博士点基金 青年基金
【CateGory Index】: Q510.3
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