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Bromelain is a type of pure natural plant protease obtained through extracting from pineapples stem, leaf, and peel, refining, purifying, concentrating, enzyme immobilization, and freeze drying. It is a light grey powder whose molecular weight is 33000 and isoelectric point is 9.55. The best quality bromelain is acquired by processing the mid-section stem of the pineapple, ultrafiltrating to filter and concentrate, and freezing and drying at low temperature. The product has been broadly applied in several industries including food and pharmaceutical.