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电化学(中英文) ›› 1996, Vol. 2 ›› Issue (1): 61-65. 

• 研究论文 • 上一篇    下一篇

溶液pH值、配体及重金属离子Hg~(2+)、Cd~(2+)、Pb~(2+)对细胞色素c电化学活性的影响

罗瑾,吴玲玲,吴金添,黄少华,林仲华   

  1. 厦门大学固体表面物理化学国家重点实验室
  • 收稿日期:1996-02-28 修回日期:1996-02-28 出版日期:1996-02-28 发布日期:1996-02-28

Effects of pH,Ligand CN-,Metallic Ions Hg ̄(+2),Cd ̄(+2) and Pb ̄(2+) on Electroactivity of Cytochrome C

Luo Jin; Wu Lingling; Wu Jintain; Huang Shaohua; Lin Zhonghua   

  1. (Stage Key Lab. for Phys. Chem. of the Solid Surf., Dept. of Chem., Xiamen Univ.,Xiamen Univ.,Xiamen 361005
  • Received:1996-02-28 Revised:1996-02-28 Published:1996-02-28 Online:1996-02-28

摘要: 本文研究了溶液pH值、配体及某些重金属离子对细胞色素c电化学活性的影响.实验发现:在pH=2.0和pH=10.0的磷酸盐缓冲溶液中,细胞色素c失活;用强的配体CN-与铁卟啉发生配位取代反应虽使溶液相中的细胞色素c失活,但不影响吸附态的细胞色素c的活性;重金属离子Hg2+、Cd2+、Pb2+对细胞色素c电化学活性影响的程度不同,影响大小的顺序为Hg2+>Cd2+>Pb2+。并对可能的机理进行了讨论。

关键词: 细胞色素c, 溶液pH值, 配体反应, 重金属离子

Abstract: The effects of pH, ligtlnd CN ̄-,metallic ions,Hg ̄(+2), Cd ̄(+2) and Pb ̄(2+) on electroactivity of cytochrome c have been studied with cyclic voltammetry and UV/Vis spectroseopy.In the phosphate buffer solution containing 5 mg/mL cytochrome c, cytochrome c is electroactive at a glod electrode with suitable pretreatment if the pH value is equal to 7.0, but it is electroinactive at the gold electrode if the pH value is equal to 2. 0 or 10.0. The existence of CN- ions in the solution would cause deactivation of cytochrome c in the bulk sulurion, and would not affect the electroactivity of cytochrome c adsorbed on the gold electrode。The sequence for effects of metallic ions on electroactivity of cytochrome c is Hg ̄(+2)>Cd ̄(+2)>Pb ̄(2+).The possible mechanisms were proposed.

Key words: Cytochrome c, pH, Ligand, Metallic ions

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