The filter paper (FPase) activity was measured according to
the method of Ghosh (1987). 50mg (1 · 6 cm2 strip) of Whatman
No. 1 filter paper were added in 0.5 ml of 0.05M sodium
acetate buffer (pH 4.8) and 0.5 ml of enzyme solution. The
mixture was incubated at 40 C for 1 h and then the reducing
sugar liberated was measured by the DNS method. One unit of
FPase activity was defined as the amount of enzyme that
released 1 lmol of reducing sugars as glucose equivalents
min1 and the specific activity is the number of units of enzyme
activity per milligram of enzyme protein.