EPR of Gamma-Irradiated Nα-Acetyl L-Glutamic Acid and Nα-Acetyl L-Glutamine

Abstract

Single crystals of Nα-acetyl L-glutamic acid and Nα-acetyl L- glutamine were γ-irradiated and the paramagnetic species formed were investigated at room temperature by electron spin resonance technique. The observed species in Nα-acetyl L-glutamic acid single crystal were attributed to the, HOOCCH<inf>2</inf>CH<inf>2</inf>C(NHCOCH<inf>3</inf>)COOH radical: and those in Nα- acetyl L-glutamine single crystal to the NH<inf>2</inf>COCH<inf>2</inf>CH<inf>2</inf>C(NHCOCH<inf>3</inf>)COOH and NH<inf>2</inf>COCH<inf>2</inf>CH<inf>2</inf>CH(NHCOCH<inf>3</inf>)COOH radicals. The g values and the hyperfine coupling constants of the unpaired electron with the environmental methylene, methine protons and 14N nucleus were determined.; Single crystals of Nα-acetyl L-glutamic acid and Nα-acetyl L-glutamine were γ-irradiated and the paramagnetic species formed were investigated at room temperature by electron spin resonance technique. The observed species in Nα-acetyl L-glutamic acid single crystal were attributed to a radical; and those in Nα-acetyl L-glutamine single crystal to other radicals. The g values and the hyperfine coupling constants of the unpaired electron with the environmental methylene, methine protons and 14N nucleus were determined.