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葡聚糖（Ｇｌｕｃａｎ）是由变形链球菌产生的葡萄糖基转移酶（Ｇｌｕｃｏｓｙｌｔｒａｎｓｆｅｒａｓｅ，ＧＴＦ）利用蔗糖合成的由α－１，６和α－１，３糖苷键连结的细胞外多糖，它通过与位于细菌表面的特异性蛋白结合，介导细菌在牙面上粘附和集聚，调节牙面微生态系统，
Glucan is an extracellular polysaccharide linked by α-1,6 and α-1,3 glycosidic bonds synthesized by sucrose from glucoamylase produced by Streptococcus mutans (GTF) Specific protein binding on the bacterial surface mediates the bacterial adhesion and accumulation on the tooth surface, regulating the micro-ecosystems of the tooth surface,