Table 1.

Experimental range and levels of the independent variables in terms of actual and coded factors in the optimization of components for LiP synthesis

Independent variable	Symbol	Level (g/L)
		−1	0	1
Glucose	X 1	2	5	8
Sodium nitrate	X 2	0.1	1.1	2
Corn steep liquor	X 3	0.1	1.1	2
Yeast extract	X 4	0.1	1.1	2
VB1	X 5	0	0.01	0.02