PRODUCTION AND CHARACTERIZATION OF A XYLANASE FROM CYATHUS-STERCOREUS

Cyathus stercoreus grown on wheat straw had a higher xylanase activity than when it was grown on rice husk or extracted hemicellulose. Inclu sion of casein hydrolysate, Tween 80 and Mn2+ (at 0.02%, 0.2% and 0.07 5%, respectively) increased the production of extracellular xylanase. Optimal yield of xylanase (0.73 U/ml) was at pH 5.6 after 9 to 12 days at 30-degrees-C. The xylanase was stable at pH 4.5 to 7.5 for 2h but above 50-degrees-C its stability fell sharply.