Extraction Process, Component Analysis, and In Vitro Antioxidant, Antibacterial, and Anti-Inflammatory Activities of Total Flavonoid Extracts from Abutilon theophrasti Medic. Leaves

Table 2

Independent variables and the levels used in the Box-Behnken design.

Independent variables	Levels
	−1	0	1
Extraction time (A, min)	20	25	30
Concentration of ethanol solution (B, %)	30	40	50
Ratio of solvent to material (C, ml/g)	20	25	30