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杂色鲍碱性磷酸酶在醇、醛和酮溶液中的失活作用
Authors
庄总来
廖金花
+3 more
洪燕飞
陈巧
陈清西
Publication date
15 November 2005
Publisher
Abstract
报道了杂色鲍碱性磷酸酶(ALP)在甲醇、乙醇、丙醇、甲醛、丙酮等溶液中的失 活动力学.结果表明:酶的剩余活力随着有机溶剂浓度的增大而迅速下降.测得上述 5种有机溶剂对该酶的半抑制率(IC50)分别为5.41、3.07、1.80、31.0×10-3、2.30 mol/dm3.在这些有机溶剂溶液中酶的失活过程都是可逆反应.检测醇、醛、酮对该酶 的失活作用机理,结果表明甲醇、乙醇、丙醇对杂色鲍ALP的失活作用均为非竞争性 机制,其抑制常数分别为5.36、3.02、1.80mol/dm3.甲醛、丙酮对杂色鲍ALP的失活 作用都呈现为混合型抑制,其对游离酶的抑制常数(K1)分别为24.7×10-3、1.66 mol/dm3;对酶-底物络合物的抑制常数(KIS)分别为56.2×10-3、5.40mol/dm3
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Last time updated on 16/06/2016