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251.001.53. The HWE-polysaccharide had the largest molecular weight (4.2 × 105 Da), reduced by the order of the UETE-polysaccharide (2.02 × 104 Da), ETE-polysaccharide (1.72 × 104 Da), and UTE-polysaccharide (1.34 × 104 Da). Thus, the four extract methods exerted significant effects on the bioactivity and characteristics of the polysaccharides. The UETE-polysaccharide from G. biloba seeds showed the highest bioactive activities and distinctive structural characteristics.Complex structure of cyanobacterium Nostoc sp. exopolysaccharide (EPS