Studies on the Electrode Process thermodynamics of Cytochrome C at A Microband Gold Electrode Modified with 4, 6-Dimethy1-2-mercaptopyrimidine

Abstract

Abstract: The redox thermodynamics of cytochrome Cat 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 Cat DMMP/Au electrode were estimated. The normal potential E^0', the changes of entropy,enthalpy and Gibbs free energy,△S⁰,△H⁰and △G⁰, for cytochrome Cat 25℃ and pH 7.0 were 0.272 V(vs. NHE),-123.7 J· mol^-1·K^-1,-63.1 kJ·mol^-1and -26.2kJ·mol^-1, respectively. The effects of temperature and pHon the thermodynamic parameters of cytochrome Cwere discussed. The E^0' vs.Tplot 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.

Key words: Microelectrode, Microband gold electrode, Cytochrome C, 4,6-Dimethyl-2-Mercaptopyrimidine, Thermodynamics

TrendMD:

CAI Chen-Xin, JU Huang-Xian, CHEN Hong-Yuan. Studies on the Electrode Process thermodynamics of Cytochrome C at A Microband Gold Electrode Modified with 4, 6-Dimethy1-2-mercaptopyrimidine[J]. Chem. J. Chinese Universities, 1995, 16(1): 31.

References

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