Abstract
Abstract From a study of proteins containing cystine residues, it is concluded that during high-energy irradiation electrons are trapped on the cystine residues. The resultant cystine anion reacts to give the -CH 2 S • radical previously observed by other workers. These reactions are affected by freeze-drying the proteins from solutions of different pH's and can be prevented by additives which scavenge electrons. If the protein contains cysteine residues, -CH 2 S • radicals are formed also by the migration of radicals on to the sulphydryl group of the cysteine. These results have been supported by a study of the radical reactions in irradiated oxidised and reduced glutathione.
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