ABSTRACT
Objective: To study the relative molecular mass and composition of Ligustrum lucidum polysaccharide purified by dialysis, and provide the theories for the relationship between the biological activity and the internal composition. Methods: In this paper, L. lucidum as an object was studied. Polysaccharide was isolated by water extraction and ethyl alcohol precipitation and purified by Sevage method, hydrogen peroxide and dialysis. After the acidolysis of trifluoroacetic acid, the molecular weight was measured by GPC, and the composition of polysaccharide was analyzed by HPLC-RID. Results: The Mw of polysaccharide was 10 721, and the Mn of polysaccharide was 10 673. L. lucidum polysaccharide consisted of glucose, rhamnose, and arabinose, the molar ratio of these monosaccharide was 9.148.105.18. Conclusion: The purified polysaccharide composition is more homogeneous, and the monosaccharides of polysaccharides was easily analyzed by HPLC-RID without column derivatization.