Seasonal variations of the polysaccharide composition of the brown alga Costaria costata were studied. It was found that the alga synthesized in April-May a high-molecular-weight (200-800 kDa) low-sulfated heterofucan; in July, primarily a low-molecular-weight (20-300 kDa) sulfated and acetylated galactofucan. A small amount (<0.01% of total alga mass) of laminaran (1,3;1,6-β-D-glucan) was observed in mature alga.
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