Abstract
ALLOXAN and dialuric acid form free radicals in alkaline solution1,2. Ninhydrin, a chemical analogue of alloxan, has been shown to form a free radical on reaction with glycine3. The electron spin resonance (ESR) spectrum of this radical consists of 9 lines and is attributed to the two pairs of equivalent benzenoid protons of ninhydrin.
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References
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Lagercrantz, C., and Yhland, M., Acta Chem. Scand., 17, 227 (1963).
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ORR, J. Free Radicals derived from Amines and Amino-acids in some Reactions of Ninhydrin. Nature 205, 1008–1010 (1965). https://doi.org/10.1038/2051008a0
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DOI: https://doi.org/10.1038/2051008a0
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