乙二胺四乙酸说明：络合剂；血液抗凝剂；生化研究中消除重金属对酶催化反应的抑制作用。

乙二胺四乙酸别名EDTA，白色粉末。溶于氢氧化钠、碳酸钠和氨溶液等碱性溶液中，微溶于水，不溶于乙醇等有机溶剂。其二钠盐应用更为广泛。因为乙二胺四乙酸能与Mg2+、Ca2+、Mn2+、Fe2+等二价金属离子结合的一种螯合剂。多数核酸酶类和一些蛋白酶类的作用需要Mg2+，所以EDTA常用做核酸酶、蛋白酶的抑制剂；也可用于消除重金属离子对酶的抑制作用。

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