FATTY-ACIDS OXIDATION STUDIED BY ELECTRON-PARAMAGNETIC-RESONANCE .2. DETECTION OF TRANSIENT FREE-RADICALS OF OLEIC, LINOLEIC, AND LINOLENICACIDS

Coordinated tert-butyl peroxy radicals on Co(III) or Fe(IV) abstract f rom mono- and polyunsaturated fatty acids at ambient temperature in be nzene solution hydrogen atom situated at beta-position to the double b ond. At low concentration of the initiator and in the presence of diss olved oxygen in a narrow temperature range of 10-40-degrees-C a 3-line EPR signal with g = 2.0050 is observed. According to analysis of the reaction mechanisms of oxidation this signal is ascribed to the primar y pentadienyl free radical transiently stabilized by complexing with m olecular oxygen. The interaction of this radical with the spin-trapper DMPO is discussed.