Description: Papain is a product extracted by bioengineering technique from the unripe papaya (pawpaw). It's natural and safe. The term papain is applied both to the Crude enzyme preparation from papaya latex and one of the distinet protease fractions. Papain is an endopeptidase with solfhydryl group it has the activity of protease and esterase. Papain has a rather broad specificity. Not only it hydrolyze animal and plant proteins, peptides esters and amides, but also it synthesizes the amino acids into plasteins. The YIngzhitang Brand crude papain contains a number of enzymes, namely chymopapain A and B, peptidase and lysozyme. The quality of our product meet the requirement of food industry, the product specification meet the requirement of FAO/WHO. Characteristics: The optimum PH for the enzyme complex is in the range of 5. 0~7. 0. The optimum temperature for the enzyme complex is in the range of 55~65 degrees Definition of enzyme activity: One unit of enzyme activity is the amount of papain, which releases equiv of tyrosine from specified casein substrate per minute in GEPF's analytical method PT01, which is available on request.