Microbial polysaccharides mainly refer to the polysaccharide produced by most bacteria, a small amount of fungi and algae. Microbial exopolysaccharides ( EPS ) are useful biomolecules secreted by bacteria under specific circumstances. 微生物多糖主要指大部分细菌、少量的真菌和藻类产生的多糖,而胞外多糖(EPS)是在一定环境条件下由微生物分泌于体外的一些高分子聚合物。