Antioxidant Activity of Phlorotannins Isolated from the Brown Alga Eisenia bicyclis

Takashi Nakamura; Kohki Nagayama; Kenji Uchida; Ryusuke Tanaka

doi:10.2331/fishsci.62.923

Antioxidant Activity of Phlorotannins Isolated from the Brown Alga Eisenia bicyclis

Takashi Nakamura, Kohki Nagayama, Kenji Uchida, Ryusuke Tanaka

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Keywords: antioxidant, phlorotannin, phloroglucinol, brown alga, Eisenia bicyclis, isolation, identification

JOURNAL FREE ACCESS

1996 Volume 62 Issue 6 Pages 923-926

DOI https://doi.org/10.2331/fishsci.62.923

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Abstract

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.

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