To obtain xylanase, solid ammonium sulfate was added to the
culture supernatant with constant stirring at 4 C to achieve an initial
30% saturation. After centrifugation at 9000 rpm for 15 min,
the precipitates were discarded and the supernatant was subsequently
adjusted to 70% saturation with the addition of appropriate
amounts of ammonium sulfate and the precipitates were
dissolved in 20 mL 0.05 M glycine NaOH buffer (pH 8.0). The enzyme
solution was subjected to dialysis for 24 h at 4 C against
0.05 M glycine NaOH buffer (pH 8.0). Enzyme activity and protein
estimation were carried out from the dialyzed sample.