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Single crystals of α-amino isobutyric acid and l-lysine monohydrochloride dihydrate were γ irradiated at 77°K and electron spin resonance spectra were observed in the temperature range between 77° and 298°K. It was confirmed that the stable radicals, (CH3)2ĊCOOH and H2N(CH2)3CH2ĊHCOOH, formed from these two amino acids, respectively, are not direct products of irradiation but are formed thermally by an inter- (or intra-) molecular reaction involving intermediate radicals in the crystals. The intermediate radicals formed at 77°K are similar in these materials and are believed to be involved in the mechanism of amino-group abstraction. The radical H2N(CH2)3CH2ĊHCOOH in llysine·HCl·2H2O exhibits different ESR spectra at different temperatures corresponding to different conformations in the crystal lattice.
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Fujimoto et al. (1968) studied this question.
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