EPR OF GAMMA-IRRADIATED N-ALPHA-ACETYL L-GLUTAMIC ACID AND N-ALPHA-ACETYL L-GLUTAMINE

Single crystals of N alpha-acetyl L-glutamic acid and N alpha-acetyl L -glutamine were gamma-irradiated and the paramagnetic species formed w ere investigated at room temperature by electron spin resonance techni que. The observed species in N alpha-acetyl L-glutamic acid single cry stal were attributed to the, HOOCCH2CH2(C) over dot(NHCOCH3)COOH radic al; and those in N alpha-acetyl L-glutamine single crystal to the NH2C OCH2CH2(C) over dot(NHCOCH3)COOH and NH2COCH2CH2CH(NHCOCH3)(C) over do t<(O)over bar OH> radicals. The g values and the hyperfine coupling co nstants of the unpaired electron with the environmental methylene, met hine protons and N-14 nucleus were determined. (C) 1997 Elsevier Scien ce Ltd.