Bovine pancreatic ribonuclease A (RNase) was modified with N-hydroxysucci n imide-activated methoxypolyethylene glycol (MPEG).

• 采用N羟基珀酰亚胺活化酯法活化单甲氧基聚乙二醇,测定了聚乙二醇(PEG)的活化度为862%25。