Abstract
Aspergillus sydowil MG49 produced 33.0 U mg-1 of extracellular xylanase activity when grown in liquid state fermeniation (LSF) with 1% ground jute stalk as the sole carbon source compared to 56.0 U mg-1 when pure xylan was used. Optimum time-course and pH for maximum enzyme production were 144 h and 4.0 respectively. The culture filtrate was devoid of any cellulase and β-xylosidase activity. The xylanase exhibited optimum activity at 60°C and pH 5.5. Partially-fermented jute stalk could be recycled at least twice for xylanase production, exhibiting 25.8 and 17.4 U mg-1 activity in two later consecutive cycles respectively.
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