Without Pasteurization, some of the ferments will remain in real draft beer, among which PrA could destroy foam protein and reduce the foam stability.

• 真正的纯生啤酒常常会因未经巴氏灭菌而残留一些酶类,其中蛋白酶A会破坏啤酒泡沫蛋白,从而使纯生啤酒的泡沫稳定性降低。