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Citation: Chen Ting-Ting, Huang Xiao-Hua, Du Jiang-Yan, Feng Yu-Ying, Liu Chang-Peng, Xing Wei, Lu Tian-Hong. Study on the Interaction Strength of La^3＋ or Eu^3＋ with Microperoxidase-8[J]. Acta Physico-Chimica Sinica, ;2004, 20(08): 887-891. doi: 10.3866/PKU.WHXB20040821 shu

Study on the Interaction Strength of La^3＋ or Eu^3＋ with Microperoxidase-8

1.
College of Chemistry and Environment Science, Nanjing Normal University, Nanjing　210097; Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun　130022

Received Date: 19 January 2004
Available Online: 15 August 2004

The interaction of La3＋ or Eu3＋ with MP-8 was studied and the interaction strength of La3＋ or Eu3＋ with MP-8 was compared. Comparing with the UV-Vis absorption spectrum of the MP-8 solution without La3＋ or Eu3＋,the position of the Soret band for the MP-8 solution with La3＋ or Eu3＋ shifts to the red direction and the absorbance decreases. The extents of the red shift of the band position and the decrease in the absorbance for Eu3＋ in the solutions without or with NaCl are larger than that for La3＋. In 0.10 mol•L－1 NaCl solution, La3＋ or Eu3＋ could completely coordinate with carboxylate oxygen of two propionic acid groups of the heme group in an MP-8 molecule when the molar ratio of La3＋ or Eu3＋ and MP-8 is 10 and 5, respectively. In addition, the cyclic voltammetric results showed that the redox peak area of Eu3＋ decreased 20％ after adding MP-8 into the solution. These results clearly illustrated that one La3＋ or Eu3＋ ion would coordinate strongly with carboxylate oxygen of two propionic acid groups of the heme group in an MP-8 molecule and the excessive La3＋ or Eu3＋ ions weakly interact with the carboxylate oxygen in the peptide chain. The interaction between Eu3＋ and MP-8 is stronger than that between La3＋ and MP-8.
- Microperoxidase-8(MP-8);La^3＋;Eu^3＋;UV-Vis absorption spectroscopy;Electrochemistry
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