Abstract
The yields of hot-water extracts (HWE), water-soluble alginates (WSA) and fucose-containing polysaccharides (FCP) from brown algae of various sources in Japan were investigated. In addition, the contents of fucose, uronic acid and suifate in the FCP were determinated. The following results were obtained. 1) The yields of HWE varied from 2.44% for Sargassum thumbergii to 19.44% for Laminariareligiosa. The HWE contents in Laminariaceae are generally higher than those in Sargassaceae. 2) The yields of WSA varied widely from nondetectable amounts for Cladosiphon okamuranus to 9% for Laminaria religiosa, which was the highest among the Laminariaceae. 3) The yields of FCP varied widely from 0.5% for Sargassum thumbergii to 10% for Eisenia bicyclis. In general, the FCP contents tended to be the highest in the algae growry at the upper intertidal zone where the alga is exposed to the sunlight for a longer more space time. 4) The FCPs from Cladosiphon okamuranus, Ishige okamurae, Ishige sinicola, and Sargassum horneri seemed to be a simple fucan sulphate constructed mostly from fucose. On theother hand, it seemed that the PCPs from most of the other samples have more complicated constitution.
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