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Published on: June 21, 2015
Prooxidative activities of tea catechins in the presence of Cu2+
Fumiko Hayakawa1, Yoko Ishizu, Nobuo Hoshino
1School of Human Cultures, The University of Shiga Prefecture, Hassaka-cho, Hikone, Japan.
Abstract:
The ability of various tea catechins to generate H2O2 and the hydroxyl radical in the presence of the Cu2+ ion was investigated and compared with the effect of iron ions. The presence of Cu2+ accelerated the generation of H2O2 by EGC, while EGCg with Cu2+ generated a little H2O2. The presence of iron ions inhibited the generation of H2O2 by EGC. EGC and EC with Cu2+ generated the hydroxyl radical, while EGCg and ECg with Cu2+ did not. The fact that EGCg showed less prooxidative activity than EGC can be explained by the chelating ability of catechin gallates to metal ions under the experimental conditions.
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