方法：采集33例正常人，26例牙周炎患者全唾液，运用聚丙烯酰胺凝胶等电聚焦方法观察其蛋白质等电点分布。
Methods: Saliva was collected from 33 healthy and 26 periodontitis individuals respectively, and analysed with isoelectric focusing in polyacrylamide gels.
用薄层聚丙烯酰胺凝胶等电聚焦电泳测得该酶的等电点为3.85和4.35；
Its isoelectric points are 3.85 and 4.35, determined by iso-eletric focusing electrophoresis.
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