Extraction Optimization and Antioxidant Properties of African Eggplant (Solanum macrocarpon) Leaf Polyphenols

Table 1

Extraction factors and their levels for Box–Behnken design.

Variables	Code	Range and level
			0	+1
Temperature (°C)		30	50	70
Time (h)		2	4	6
Ratio of powder to water (w/v)		1 : 10	1 : 20	1 : 30