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The sulfated exopolysaccharide extracted from marine microalgae attracted considerable attention from both the nutraceutical and pharmaceutical industries. In the present study biomass of five marine microalgae were screened to find strains with high capacity for the production of sulfated exopolysaccharides. The anticoagulant and antioxidant activities of extracted sulfated polysaccharides were evaluated using activated partial thromboplastin time (aPTT), prothrombin time (PT), DPPH and ABTS assays, respectively. The sulfated polysaccharides extracted from  Picochlorum  sp. showed a strong DPPH scavenging effect with 85% antioxidant activity .  The sulfated polysaccharides of  Chlorella sorokiniana ,  Chlorella  sp. (L 2 ) and  Chlorella  sp. (D 1 ) scavenged more than 90% of the ABTS radicals. However, the sulfated polysaccharide extracted from  Chlorella sorokiniana , and  Chlorella  sp. ( N4 ) showed anticoagulant properties. The dual anticoagulant-antioxidant activities in  Chlorella sorokiniana  could be explained by the combination of various factors including sulfate content and their binding site, monosaccharide residue and glycoside bond which are involved in the polysaccharide’s bioactivity.

Characterization, antioxidant and anticoagulant properties of exopolysaccharide from marine microalgae