Table 3. Main effects of selected factors.

Serial No.	Factor	Level 1	Level 2	Level 3	L2-L1
1	Temperature	861.666	501.666	-	−360.001
2	pH	865.0	830.5	299.5	15.5
3	Wheat bran	639.5	831.333	574.166	191.832
4	Inoculum	822.333	665.166	557.5	−157.167
5	Biotin	723	777.833	544.166	54.832
6	KH2PO4	773.833	649.166	622	−124.667
7	Corn steep liquor	702.166	656.5	686.333	−45.667
8	Xylidine (inducer)	814.166	649	581.833	−165.167