Bromelain is a protease derived from the pineapple, usually from the stem.



(1) protein composition

(2) number of units of activity per mg protein


1 unit of bromelain activity is defined as release of 1 micromole of p-nitrophenol from N-alpha-Z-L-lysine p-nitrophenyl ester per minute at 25°C and pH 4.6.


Preparations of bromelain are often 30 to 50% protein.


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