Specific features of radical generation in the reaction of thiols with hydrogen peroxide

Abstract

Using the method of inhibitors it was found that the reduction of H2O2 with natural thiols in aqueous solutions is accompanied by the formation of radicals. The reaction of the nitroxyl radical TEMPO with glutathione (GSH) and H2O2 was studied together and separately. It allowed us to determine the optimal conditions for using the spin trap method in the presence of thiols. In the case of 5,5′-dimethyl-1-pyrroline N-oxide the reaction of GSH and synthetic thiol N-acetylcysteine with hydrogen peroxide at pH < 7 leads to the formation of thiyl and hydroxyl radicals.