Oxidation of serotonin and 5-hydroxyindoles during the denaturation of oxyhaemoglobin

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Abstract
Oxyhemoglobin, when it is undergoing denaturation, can oxidize serotonin and several related 5-hydroxyindoles. The reaction is completely inhibited by CO and partially inhibited by ascorbic acid. The oxidized product(s) is characterized by a pink colour, a change in the ultraviolet-absorption spectrum and a loss of fluorescence.