Động học ức chế thủy phân protein dự trữ, xúc tác bởi papain từ quả đu đủ xanh. The hydrolysis of reserve protein catalyzed by papain has been inhibited by Flavonoid. The inhibition was found competitive. Calculated constants of hydrolytic reaction have been estimated as following: VM = × 10-3 ; k2 = sec-1 ; Ks = × 10-5 M; Ki= × 10-3.