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Five antioxidative substances in the brown alga Eisenia bicyclis were isolated by silicic acid column chromatography and thin-layer chromatography. They were identified to be phloroglucinol and its polymers, namely eckol, phlorofucofuroeckol A, dieckol, and 8, 8'-bieckol on the basis of spectroscopic evidence (IR, FABMS, and 1H and 13C NMR). Their potent antioxidant effect extended the induction time of autoxidation of methyl α-linolenate.
Nakamura et al. (Mon,) studied this question.
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