In presence of a beef spleen preparation at pH 7.8 leucinamide was converted to an insoluble material, with the liberation of NH_3. This reaction required the presence of a sulphydryl compound and versene for maximal activity.

• 牛脾酶制剂于pH 7.；8及半胱氨酸存在下；具有明显的催化从白氨酰胺生成聚白氨酸的作用。