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On the basis of chemical and spectral analyses, the fucoidan fractions obtained were found to be the sulfated fucogalactans containing sulfate ester groups and uronic acid, and composed essentially of fucose and galactose, as well as a minor amount of other sugars. The polysaccharide fractions were tested for anticancer activity. The primarily obtained results showed that all fucoidan fractions isolated from S. swartzii demonstrate bioactivity effects against cancer cells, while fraction F5 with a highest sulfate content exhibits the strongest antiinvasion activity. This indicates that sulfate content plays an important role in the anticancer activity of the brown algal fucoidans. | Studies on fucoidan and its production from Vietnamese brown seaweeds
