Briefly, 100μl of crude extract was pre-incubated with 200μl of standard amylase for 15 minutes at 37°C in one set of tubes. In the other set of tubes human urinary amylase was pre-incubated with 100μl of phosphate buffer, pH 6.9. 400μl of potato starch at increasing concentration (0.15-5.0mg/ml) was added to both sets of reaction mixtures to start the reaction. The mixture was then incubated for 20 minutes at 37°C, and then boiled at 100°C for 15 minutes after addition of 2ml of DNS to stop the reaction. The amount of reducing sugars released was determined spectrophotometerically using a maltose standard curve and converted to reaction velocities