Abstract
A novel multistage water-based process was evaluated for the production of sap and other liquid fractions from frozen Sargassum muticum in an attempt to propose an integral and yearly-around utilization of this invasive alga. Three aqueous extracts including (i) the defrosting liquid phase, (ii) the sap liquid obtained by pressing and (iii) the autohydrolysis extract from the solid residue remaining after pressing were characterized for yield, phenolic content, reducing power and antiradical properties. Alginate precipitation and a further liquid–liquid extraction stage using ethyl acetate were assayed to concentrate the phenolic fraction. Alginate exhibited similar viscoelastic features to those commercial available. The aqueous extracts contained 3–12 g phloroglucinol equivalents (PGE)/100 g extract, whereas the ethyl acetate extracts contained up to 55 g PGE/100 g extract and 1 g was as potent ABTS+ radical scavenger as 0.5 g Trolox. The aqueous phase produced by autohydrolysis of the solids were cytotoxic against HCT 116 cells (IC50 < 50 µg mL) without noxious effect on normal cells.
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