A conjugate of a protein or polypeptide and a metal ion is prepared by reacting a metal ion transfer complex comprising a chelate of 4,5-dihydroxyl-m-benzenedisulfonic acid or a salt thereof with a protein or polypeptide that is covalently bound to an exogenous chelating group having a greater affinity than 4,5-dihydroxyl-m-benzenedisulfonic acid for the metal ion.
蛋白质或
多肽与
金属离子的共轭物的制备方法是,将包含 4,5-二羟基间苯二磺 酸螯合物或其盐的
金属离子转移复合物与蛋白质或
多肽反应,该蛋白质或
多肽与外源螯合基团共价结合,该外源螯合基团对
金属离子的亲和力大于 4,5-二羟基间
苯二磺酸。