菠萝蛋白酶又称菠萝酶。由菠萝汁、皮等提取的巯基蛋白酶。浅黄色无定形粉末，微有特异臭。分子量33000。对酪蛋白、血红蛋白、BAEE的适宜pH值是6~8，对明胶是pH值5.0。酶活性受重金属抑制。略溶于水，不溶于乙醇、丙酮、氯仿和乙醚。它优先水解碱性氨基酸(例如精氨酸)或芳香族氨基酸(例如苯丙氨酸、酪氨酸)的羧基侧上的肽链，选择性水解纤维蛋白，可分解肌纤维，而对纤维蛋白原作用微弱。可用于啤酒澄清、药用消肿。

 
Also known as Bromelain. A sulfhydryl protease from pineapple juice, Peel, etc. . Light yellow amorphous powder, slightly peculiar odor. Molecular weight 33,000. The optimum pH value for casein, hemoglobin, BAEE is 6 ~ 8, and for gelatin is 5.0. The enzyme activity was inhibited by heavy metals. Slightly soluble in water, insoluble in ethanol, acetone, chloroform and ether. It preferentially hydrolyzes peptides on the carboxyl side of basic amino acids (such as arginine) or aromatic amino acid (such as L-Phenylalanine and tyrosine) , selectively hydrolyzes fibrin and breaks down muscle fibers, the effect on fibrinogen was weak. Can be used for beer clarification, medicinal swelling.