Five preparation methods were used to purify the crude polysaccharide which was the co-products of preparation saponin from Ophiopogonis japonicus (Thunb.)Ker-Gawl.The results indicate that the method of enzyme hydrolysis could purify the crude polyseccharide efficiently.The content of polysaccharide is more than 85% and could be used as the foods and medicine raw material.Aduanced test showcd that the polysaccharide is mainly consist of glucose,fructose,xylose,rhannose and galactose.
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