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In this study, electron paramagnetic resonance spectroscopy was used to investigate free radicals formed in gamma irradiated L-glutamine hydrochloride, iminodiacetic acid hydrochloride and N-(2-hyroxyethyl) iminodiacetic acid powders. The free radicals produced in L-glutamine hydrochloride powders were attributed to the CH 2Ċ HCOOH radical; and those in iminodiacetic acid hydrochloride and N-(2-hyroxyethyl) iminodiacetic acid powders to the HNCHCH 2 (COOH) 2 and HOCH 2 CH 2 NĊHCH 2 (COOH) 2 , respectively. The g-values of the radicals and the hyperfine structure constants of the free electron with the environmental protons and 14 N nucleus were determined. The samples were not displayed before they were not irradiated. The free radicals were found stable at room temperature for more than six months. Some spectroscopic properties and suggestions concerning possible structure of the radicals are discussed in this paper.

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