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 poly mers, namely eckol, phlorofucofuroeckol A, dieckol, and 8,8•OE-bieckol on the basis of spectroscopic evi dence (IR, FABMS, and 1H and 13C NMR). Their potent antioxidant effect extended the induction time of autoxidation of methyl ƒ¿-linolenate.
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