S-Nitrosoglutathione (GSNO) exhibits inhibition effect on linoleic acid peroxidation and on styrene polymerization, using 2,2'- azobisisbutylnitrile (AIBN) as the initiator. Heating a solution of GSNO and AIBN in DMSO under argon produced an EPR signal, which was attributed to glutathiyl 2-cyano-2-propyl aminoxyl radical by comparison with the EPR spectrum obtained with a solution of NO and AIBN under the same experimental conditions. The results suggested that GSNO was converted to an aminoxyl radical and acted as such in the inhibition experiments.

Key words: GLUTATHIONE, RETARDATION, INHIBITOR, LINOLEIC ACID, STYRENE, POLYMERIZATION, PR