Abstract
Crystalline Glu, Lys and Cys had the antioxidative activities and inhibited the oxidative activity of ferrous chloride by the Active Oxygen Method (98°C).
The inhibitory activities of the mixtures of L-amino acids containing Glu, Lys or Cys on the oxidative activity of ferrous chloride were proportional to those of L-amino acids described above. The inhibitory activities of peptides on the oxidative activity of metal salt were not proportional to those of the mixtures of the constituent L-amino acids.
Polypeptides and proteins had small inhibitory activities on the oxidative activity of iron (II) chloride in comparison with Glu or Lys. Peptides and the mixtures of the constituent L-amino acids inhibited the oxidative activity of copper (II) sulfate.
Iron and copper seem to adhere loosely on the surface of crystalline peptides under the conditions of Active Oxygen Method on the basis of IR spectra of the obtained metal-peptide complexes.
However, the loss of the oxidative activities of metal salts was nots proportional to the amounts of metal in the metal-peptides or metal-L-amino acids complexes.
