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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 15, Number 5
JKCSEZ 15(5)
October 20, 1971 

An ESR Study of Amino Acid and Protein Free Radicals in Solution. Part Ⅳ. An ESR Study of Gamma-Irradiated Amino Acids in Frozen Aqueous Solutions
Sun-Joo Hong, D. E. Holmes, L. H. Piette
An ESR study has been made on free radicals produced in frozen aqueous solutions (ices) of glycine, DL-α-alanine, DL-serine, L-cysteine, DL-leucine and DL-isoleucine by gamma-irradiation at dry ice temperature. All free radicals induced were decayed concomitant to the successive annealing but the radical species which is believed to be dominant seems to be stable even near the melting point of the ice. These dominant species were found to be identical to those resulted from direct action of radiation in the solid at room temperature. Small but significant changes in the spectra of glycine and DL-α-alanine were observed by varying the microwave power. These results seem to support the view that the spectra obtained were composite consisting of more than two different resonances having different power saturation characteristics. The relative contribution of unidentified resonances to the composite spectra was greater for solutions of low concentration. These resonances are assumed to be induced by indirect effects, mainly hydrogen abstraction by radiation produced hydroxyl radicals and also C-N bond cleavage by hydrated electrons.
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