Radical scavenging properties of tryptophan metabolites were estimated using their radical reactivity. Metabolites of the kynurenine and the melatonin biosynthesis pathway were mainly examined by use of a kinetical model. Their radical reactivity was determined as the reaction rate constant with a stable free radical, such as galvinoxyl; that is a phenoxy radical. The rate constants of the metabolites have a widely ranged spectrum, which can be divided into three groups. The first group (3-hydroxykynurenine, 3-hydroxyanthranilic acid, and indole-3-pyruvic acid) is more reactive than a-tocopherol; the reactivity of the second group (xanthurenic acid, serotonin, N-acetylserotonin) is similar to that of buty-lated hydroxy toluene (BHT); the third group (kynurenic acid, melatonin, and other ones) is less reactive than BHT.
CITATION STYLE
Goda, K., Hamane, Y., Kishimoto, R., & Ogishi, Y. (1999). Radical Scavenging Properties of Tryptophan Metabolites (pp. 397–402). https://doi.org/10.1007/978-1-4615-4709-9_50
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