Table 1.

Actual and coded levels of the variables studied in BBD.

	Levels used
	Low (− 1)	Middle (0)	High (1)
Independent variables
X1: ethanol/water ratio%	50	72.5	95
X2: extraction time	24 h	48 h	72 h
X3: material/solvent ratio	1:20	1:15	1:10
Dependent variables
Y1: Yield (gm)
Y2: Total phenolic content (μg/mg)