用等电聚焦电泳法测得其等电点约为7.2。结论：从栖热菌中提取的耐热乳糖酶的理化性质不同于其它来源的乳糖酶。
Its pI was about 7.2. Conclusion:The thermostable lactase from strain of thermus sp A3 was different from lactases from other microorganism.
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.
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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