Papain is a low-specific proteolytic enzyme found in Carieapapaya. It is widely found in the roots, stems, leaves and fruits of papaya, and is most abundant in unripened milk.
The active center of papain contains cysteine, which belongs to sulfhydryl protease. It has the characteristics of high enzyme activity, good thermal stability, natural health and safety, etc. Therefore, it has been widely used in food, medicine, feed, daily chemicals, leather and textile industries.