Abstract
The interaction of cobalt(II), nickel(II), copper(II) and zinc(II) with D-penicillamine disulphide, oxidized glutathione and L-cysteinylglycine disulphide were studied by pH-metric, spectrophotometric and EPR methods. D-Penicillamine disulphide forms binuclear complexes with all the metal ions studied. The formation of 1:1 complexes is characteristic of oxidized glutathione. L-Cysteinylglycine disulphide behaves like dipeptides, but the presence of two separate peptide moieties also results in the formation of various binuclear complexes. Metal ion-disulphide binding was not observed in any case.
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