作者研究变形链球菌CY-1利用各种碳水化合物在体外合成细胞外不溶性多糖。结果表明,在蔗糖培养基内,该菌合成细胞外多糖量最多;在只含葡萄糖、果糖、麦芽糖和乳糖培养基内,只有少量多糖合成;当蔗糖与这些糖混合时,多糖合成量明显增加(P<0.005)。细菌不利用甜菊糖、山梨醇和木糖醇合成细胞外不溶性多糖。 The authors study S. mutans CY-1 utilizes various carbohydrates to synthesize extracellular insoluble polysaccharides in vitro. The results showed that in the sucrose medium, the amount of extracellular polysaccharide synthesis of the bacteria most; only glucose, fructose, maltose and lactose medium, only a small amount of polysaccharide synthesis; when sucrose mixed with these sugars, polysaccharide synthesis increased significantly (P <0.005). Bacteria do not use stevioside, sorbitol and xylitol synthesis of extracellular insoluble polysaccharides.