The electron paramagnetic resonance (EPR) of gamma irradiated powders of dl-alanine ethyl ester hydrochloride, l-theanine and l-glutamic acid dimethyl ester hydrochloride were investigated at room temperature. The observed paramagnetic species were attributed to the CH3ĊHCOOC2H5, –CH2ĊHCOOH and –CH2ĊHCOOCH3 radicals, respectively. Hyperfine structure constants and g-values were determined for these three radicals. Some spectroscopic properties and suggestions concerning the possible structure of the radicals were also discussed.
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