Chemical characteristic of an anticoagulant-active sulfated polysaccharide from Enteromorpha clathrata

► Polysaccharide FEP was isolated from Enteromorpha clathrata. ► FEP was a high arabinose-containing sulfated polysaccharide. ► The backbone of FEP was composed of specific arabinopyranose units. ► FEP possessed a good anticoagulant activity in vitro. ► FEP is a novel polysaccharide and potential source of anticoagulant.