Electrochemistry of copper(II)-peptide complexes containing histidine residues

Ko Takehara, Yasushi Ide

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Abstract

Copper(II)-peptide complexes (peptide = GHL1 1 GHL = glycyl-L-histidyl-L-lysine; GHG = glycyl-L-histidylglycine; GH = glycyl-L-histidine; GGG = triglycine; GGH = glycyl-L-histidine., GHG and GH) were investigated in aqueous solution by various electrochemical methods. The electrode reaction was measured at various pH levels. The distribution profile of the species was determined using potentiometric titration. After considering the effect of electrostatic repulsion between charged electrode surface and GHL, the coordination structure of Cu(II)-GHL determined by the two methods was in agreement. Electroplating was used to investigate the adsorption mechanism of Cu(II)-GHL, and it was found that the adsorption of Cu(II)-GHL changed the coordination structure of Cu(II)-GHL, causing a shift in the reduction potential of adsorbed Cu(II)-GHL toward the reduction potential of free Cu(II) ion.

Original languageEnglish
Pages (from-to)195-202
Number of pages8
JournalInorganica Chimica Acta
Volume183
Issue number2
DOIs
Publication statusPublished - May 15 1991

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All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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