Culture Condition Improvement for Phytase Production in Solid State Fermentation by Aspergillus ficuum Using Statistical Method

Table 3

Experimental variables at different levels used for RSM approach.

Variables	Units	Symbol code	Levels
			−2	−2	0	+1	+2
Moisture	% (w/w)	𝑋1	55	60	65	70	75
MgSO4	g/g dry substrate %	𝑋2	0.2	0.3	0.4	0.5	0.6
Glucose	g/g dry substrate %	𝑋3	4	7.5	11	14.5	18
Time	Hours	𝑋4	72	96	120	144	168