without any additives were monitored for 240 h. Results indicated that, the high level of inulinase attained within 96 h. The inulinase production reached about (5.680 ± 0.183 U/gds) after 96 h of solid-state fermentation, and after that, the activity decreased with increasing the time of fermentation. The observed decline in inulinase activity after 96 h of incubation could be a result of protease degradation, decrease in nutrient availability in the medium and catabolic repression of the enzyme (Kango, 2008; Wang & Zhou,2006). This was in agreement with the previous studies on A. niger
ATCC 20611 (Dinarvand et al., 2012) indicated the maximum inulinase production obtained after 96 h of incubation at 30 ◦ C. Hence,all the experiments of optimization were carried out for 96 h.