Xylanase production by the thermophilic fungus, Melanocarpus albomyces IIS68, during solid state fermentation of wheat straw was studied and the effects of various variables were observed. Using the response surface methodology and the multivariant statistical approach, the optimum levels of the variables affecting
xylanase production were determined. The optimum levels of the variables were 600-850/an particle size, 43h inoculum age, 1.37%Tween 80, 86Yo initial moisture content, 5.1% urea, 0.74°/yeast extract and a harvest time of 96 h. Under these optimized conditions, xylanase activity of 7760 U/g initial dry substrate was obtained
which was in very good agreement with the value predicted by the quadratic model (7890 U/g initial dry sub-strafe).