Abstract:  Preparation technology of sulfated polysaccharides from Undaria Pinnatifida (Charv.) Suringer has been studied;one-factor experiment, one afactor experiment orthogonal experiment were investigated. The optimal condition chosen extractiontemperature 100℃, extraction time 4 h, ratio of solution to algae power 80. Follow this condition, we get three samples use grade-precipitation by alcohol, the average content of polysaccharides, sulfate, protein is 28.0%, 10.8%, 0.71% respectively. From IR,the characteristic peak of polysaccharides, sulfate can be seen, and sulfate link polysaccharides at C2 or C3 as equatorial, the samplesof polysaccharides are pyranose of β-glycosides mainly.

Key words: Undaria Pinnatifida(Charv.)Suringer, sulfated polysaccharides, extraction technology, physical chemis-try properties