Activated methoxypolyethylene glycol (mPEG 2) was used to modify L asparaginase. During this course, L Asn, the substrate of L asparaginase, was added to protect the active center of the enzyme.

• 使用活化的单甲氧基聚乙二醇 ( m PEG2 )对 L -天冬酰胺酶进行修饰 ,修饰过程中加入底物 L-天冬酰氨保护酶的活性中心。