Table 5.

Experimental ranges of the most significant independent variables used in response surface method (RSM).

Name	Code	Units	Variable level codes
			− α	− 1	0	+ 1	+ α
Peptone	A	g/l	5	6.25	7.5	8.75	10
Temperature	B	°C	30	31.75	33.5	35.25	37
Agitation	C	rpm	120	140.00	160.0	180.00	200
Inoculum size	D	%	1	1.50	2.0	2.50	3