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