title: Direct electrochemistry behavior of cytochrome c/L-cysteine modified electrode and its electrocatalytic oxidation to nitric oxide.
abstract: Cytochrome c (Cyt c) was successfully immobilized on L-cysteine modified gold electrode by multicyclic voltammetry method. The electrochemical behavior of Cyt c on the L-cysteine modified electrode was explored. In 0.10 M, pH 7.0 phosphate buffer solution (PBS), Cyt c showed a quasi-reversible electrochemical redox behavior with E(pc)=0.180 V, E(pa)=0.208 V (versus Ag/AgCl). The Cyt c/L-cysteine modified electrode gave an excellent electrocatalytic activity towards the oxidation of nitric oxide, and the catalysis currents were proportional to the nitric oxide concentration in the range of 7.0 x 10(-7) to 1.0 x 10(-5) M, the linear regression equation is I (microA)=-0.124-0.003 C(NO) (microM), with a correlation coefficient 0.996, The detection limit was 3.0 x 10(-7) M (times the ratio of signal to noise, S/N=3).
authors.affiliation: School of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu 241000, PR China.
authors.forename: Yun-Chun
authors.initials: YC
authors.lastname: Liu
authors.forename: Shi-Qiang
authors.initials: SQ
authors.lastname: Cui
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.forename: Zhou-Sheng
authors.initials: ZS
authors.lastname: Yang
mesh_terms: D000327:Adsorption; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D002384:Catalysis; D003545:Cysteine / Q000737:chemistry*; D045304:Cytochromes c / Q000737:chemistry*; D004553:Electric Conductivity; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D009569:Nitric Oxide / Q000032:analysis* / Q000737:chemistry*; D010084:Oxidation-Reduction
chemical_list: D009569:Nitric Oxide; D045304:Cytochromes c; D003545:Cysteine