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Volume :11 Issue : 1 1984      Add To Cart                                                                    Download

Binary complexes of Zn (II) and Cd (II) with peptides

Auther : N. F. EWEISS, M. S. EL-EZABY AND J. M. AL-HASSAN

Departments of Chemistry and Biochemistry, University of Kuwait

 

ABSTRACT

 

Solution equilibria for Zn (II) and Cd(II) complexes with di- and tetrapeptides containing

0-Benzyl-L-Tyrosine and glycine residues in 80% by weight dimethylsulphoxide-water mixed solvent have been studied. The determination was carried out by pH titration at 30°C and I =0.10M (NaN03). Binary 1: 1 peptide to metal ion complexes were found to exist only in the pH range - 5.00-9.50. The binary complexes for glycine and 0-Bzl-L-tyrosine have been studied in the same pH range. The existence of 1: 1 and 2: 1 amino acid to metal ion complexes is probable. The formation constants for the di- and tetrapeptides as well as the amino acids have been determined using the MINIQUAD programme.

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