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  • Title: Radical scavenging activity of tea catechins and their related compounds.
    Author: Nanjo F, Mori M, Goto K, Hara Y.
    Journal: Biosci Biotechnol Biochem; 1999 Sep; 63(9):1621-3. PubMed ID: 10610125.
    Abstract:
    (-)-Epigallocatechin gallate was found to be the most effective scavenger among tea catechins for the superoxide anion, hydroxyl radical, and 1,1-diphenyl-3-picrylhydrazyl radical. Examination of the scavenging effects of tea catechins and their glucosides on superoxide anion showed that the presence of at least an ortho-dihydroxyl group in the B ring and a galloyl moiety at the 3 position was important in maintaining the effectiveness of the radical scavenging ability. Stoichiometric factors of tea catechins were estimated to be 2 for (+)-catechin and (-)-epicatechin, 5 for (-)-epigallocatechin, 7 for (-)-epicatechin gallate, and 10 for (-)-epigallocatechin gallate.
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