求翻译：are able to react with peroxide radicals. Its antioxidant activity shows a synergistic effect with vitamin E (Okai and Higashi-Okai 2001). Within the aqueous fraction, polyphenols are the main compounds responsible for the antioxidant activity of the algae. Gallic acid and flavanolssuch as catechins and their derivativ是什么意思？

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