musa paradisiaca stem was collected from the local garden .The enzyme was isolated by washing the stem with milli Q water,cutting it into small pieces,crushing the pieces in mortar pestle, extracting the juice by keeping the pieces in four layers of cheese cloth and squeezing it.
The juice was centrifuged using Sigma refrigerated centrifuge (model 3K30,Germany) at 4000 g for 20 min at 4c to remove the cloudiness. The clear juice (340 ml) was concentrated using Amicon concentration cell model 8200 and ultrafiltration membrane PM-10 with molecular wt. cut-off value of 10 kDa.The concentrated crude enzyme solution (4 ml) was dialyzed against 4 L of 10 mM sodium acetate buffer (pH 6.0) for 24 h over three changes of the buffer.