γ -Irradiated powders of N-acetyl-L-arginine, N

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Electron paramagnetic resonance (EPR) spectra of γ -irradiated single crystals of l-glutamine (LG) and l-glutamine-t-butyl ester hydrochloride (LGBESHCI) powders were studied and analyzed for different orientations of the crystals in the magnetic field, after γ -irradiation. The spectra were observed to be independent of temperature down to 130 K. The hyperfine interaction tensors for one α proton and two β protons of radical have been determined at 295 K. An analysis of the EPR of γ -irradiated single crystals of LG and LGBESHCI powders shows that the paramagnetic species produced by the radiation damage is CH 2Ċ H. The g values of the radical and the hyperfine structure constants of the free electron with nearby protons and 14 N nucleus were determined. The results were found to be in good agreement with the existing literature data.