The substrates glycine, dl-u-alanine, and B-alanine have been examined in turn within an aqueous continuous-flow system using the titanous chloride -hydrogen peroxide radical-generating method.The temperature was 25 i 2 "C and the p H of the reaction mixture was varied within the range of values ca. 2 to ca. 5 by addition of sulfuric acid. The electron paramagnetic resonance spectra of the following transient radicals were observed: from glycine, .CH(NHZ)COOH; from dl-a-alanine, CH3C(NNZ)COOH and .CH2CH(NH3+)COOH; and from P-alanine, CH2(NH3+)CHCOOH.