Abstract
The sulfated and acetylated derivatives of the sulfated polysaccharide extracted from red algae Gracilariopsis lemaneiformis were synthesized, and their antioxidant and immunological activities were investigated. And then the relationship between the activity and chemical characteristics was characterized. The results of chemical analysis and FT-IR showed the modification of polysaccharide was successful. In addition, it was found that a certain derivative exhibited stronger antioxidant activity than the one unmodified in the same experiment. The sulfated and acetylated derivatives showed different activities on the T and B lymphocytes proliferation. They may be of potential value as a possible supplement in food and pharmaceutical industries.
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