To measure exo-activities of glycosidases in the two enzyme preparations, synthetic p-nitrophenyl (PNP) glycosides were used.About 25 L of USP or Ebs or diluted solutions thereof was mixed with 25 L of 0.1 w/w % of the PNP-glycoside solution. The mixture was incubated with 75 L of 0.05 M NaOAc buffer, pH 5.0 for one hour at 30◦C. After this, 125 L of 0.5 M glycine NaOH buffer, pH 9.0 containing 0.002 M EDTA was added and the absorbance of the PNP released was measured at 405 nm. The activity of the enzymes was expressed as units (U) of PNP released per mL of enzyme solution,where 1U corresponds to 1 mol of PNP released per min.