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To investigate structure–bioactivity relationship of LBP, Lycium barbarum polysaccharide (LBP) was extracted and separated into five fractions using ultrafiltration membrane method. Then the effects of these polysaccharide fractions on human liver cancer cells (SMMC-7721) were observed by MTT assay, LSCM and FCM. And the components, molecular weight and conformation of LBP fractions were analyzed...
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