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Effects of tryptophan, 5-hydroxytryptophan, serotonin, and melatonin on final product formation during radiolysis of deaerated and oxygen-saturated ethanol and aqueous 1M ethanol solutions were studied. The named amino acids were found to be capable of adding α-hydroxyethyl radicals, thereby suppressing recombination reactions of these species. Unlike melatonin, tryptophan, 5-hydroxytryptophan, and serotonin were able to reduce oxygen-centered radicals being formed on radiation-chemical oxidation of ethanol in the presence of oxygen via electron transfer from the amine nitrogen lone pair.

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