Use an absorbance colorimetry based assay. Put in excess substrate and a small known quantity of enzyme and then measure either product formation or reagent disappearance over a time course of a few hours. During the linear part of the resulting graph you can then determine enzyme activity from the gradient of the slope.

Thanks for the answer .. can you suggest a substrate for each of them .. more detailed procedure for better understanding Robert Adolf Brinzer

Are you interested in enzymes that synthesize or those that degrade your compounds (papain and bromelain)? Also have you isolated your enzyme?