Aqueous buffered solutions of 2-(5-aminopentyl)aminoethyl-phosphorothioate (WR-2823) and 2-(3-aminopropyl)aminoethyl-phosphorothioate (WR-2721) as well as some of their "latent derivatives" (corresponding thiols and disulfides), labeled with35 S and32 P, were irradiated by a 400 Ci137 Cs γ-ray source. The radiation products were separated, identified and measured quantitatively by paper chromatography. The radiolysis of these compounds brought about oxidation of the sulfur atom with subsequent dephosphorylation, and then further oxidation occurred to either the sulfonic acid or to inorganic sulfate. The oxidation of these radiation protective agents indicates that they are capable of reacting with radicals formed in irradiated aqueous solutions thus offering partial protection against irradiation induced changes. This protection was shown in two systems in vitro: (a) radiation-induced permeability of erythrocyte membranes and (b) radiation-induced decrease in specific viscosity of DNA solutions.

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