有研究显示，在碳化二亚胺的存在下，蛋白质和酶可以和新制备的磁体共价连接。
It has been shown that proteins and enzymes can be bound covalently to freshly prepared magnetite in the presence of carbodiimide.
这样制备的吸附剂的性质与承载共价键连接鳌合官能团材料的性质相同。
Thus-prepared sorbents possess the properties of materials bearing covalently-bonded chelating functions.
目的 叶酸与壳聚糖偶联，并制备不同连接比例的叶酸偶联壳聚糖。
Objective To couple folate with chitosan and prepare folate-coupled chitosan by different connection ratio.
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