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Antioxidant activities of phlorotannins isolated from Japanese Laminariaceae

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Abstract

The antioxidant activities of brown algal phlorotannins were evaluated using the inhibition of phospholipid peroxidation in the liposome system, and by determining radical scavenging activities against the superoxide anion and 1,1-diphenyl-2-picrylhydrazyl (DPPH). Oligomers of phloroglucinol (1,3,5-trihydroxybenzene), eckol (a trimer), phlorofucofuroeckol A (a pentamer), dieckol and 8,8′-bieckol (hexamers), isolated from the Laminarian brown algae Eisenia bicyclis, Ecklonia cava and Ecklonia kurome, showed potent inhibition of phospholipid peroxidation at 1 μM in the liposome system. The phlorotannins had significant radical scavenging activities against the superoxide anion (50% effective concentration values: 6.5–8.4 μM) and DPPH (50% effective concentration values: 12–26 μM), and were more effective compared to ascorbic acid and α-tocopherol. For the purpose of using phlorotannins as functional food ingredients, the antioxidant activity of a complex of crude phlorotannins and soybean protein was examined. The complex had a pronounced DPPH-radical scavenging activity. These results suggest that phlorotannins are potent anti-inflammatory substances, and that the Laminariaceous brown algae, which are abundant in phlorotannins, may be useful as a new functional foodstuff or supplement with anti-inflammatory activity.

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Acknowledgments

We thank grateful to Dr. Takashi Nakamura of the Graduate school of Kyushu University for his cooperation throughout this study. This work was supported in part by the Comprehensive Research Laboratory of Fukuoka Institute of Technology.

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Correspondence to Toshiyuki Shibata.

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Shibata, T., Ishimaru, K., Kawaguchi, S. et al. Antioxidant activities of phlorotannins isolated from Japanese Laminariaceae. J Appl Phycol 20, 705–711 (2008). https://doi.org/10.1007/s10811-007-9254-8

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  • DOI: https://doi.org/10.1007/s10811-007-9254-8

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