Alginate,mannitol, phenolic compounds and biological activities of two range-extending brown algae, <Emphasis Type="Italic">Sargassum mangarevense</Emphasis> and <Emphasis Type="Italic">Turbinaria ornata</Emphasis> (Phaeophyta: Fucales), from Tahiti (French Polynesia) |
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Authors: | Mayalen Zubia Claude Payri Eric Deslandes |
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Institution: | 1.Laboratoire d’Ecophysiologie et de Biotechnologie des Halophytes et des Algues Marines EA 3877 (LEBHAM),Université de Bretagne Occidentale,Plouzané,France;2.IRD,Nouméa,New Caledonia;3.Université de Polynésie Fran?aise,Faaa Aéroport,French Polynesia |
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Abstract: | This study deals with two range-extending brown algae from Tahitian coral reefs, Sargassum mangarevense and Turbinaria ornata; their alginate properties, mannitol and phenolic contents, antioxidant and antimicrobial activities were determined. Turbinaria ornata showed the richest alginate content with the highest extraction yield (19.2 ± 1.3% dw). Their alginates also exhibited the
highest viscosity (50 ± 18 mPa.s), but the M:G ratios (mannuronic acid to glucuronic acid) of alginates (1.25–1.42) were similar
in both species. Alginate yield displayed spatial variations, but no significant seasonal changes. The highest mannitol content
was found in S. mangarevense (12.2 ± 2.1% dw) during the austral winter. With respect to other tropical Fucales, both algae exhibited also a high phenolic
content (2.45–2.85% dw) with significant spatio-temporal variations. Furthermore, high antioxidant activity and activity against
Staphylococcus aureus were also detected in extracts. According to these preliminary results, these two range-extending algae are of key interest
in numerous industrial areas. |
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Keywords: | Sargassum mangarevense Turbinaria ornata Alginate Mannitol Phenolic compounds Biological activities |
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