Table 1.

Facts and levels for central composite design-response surface method

Factors	Levels and code values
-α	−1	0	+1	+α
Lecithin (mg)	24	67.78	132	196.22	240
Res (mg)	20	40.27	70	99.73	120
Water volume (mL)	100	140.54	200	259.46	300

Abbreviation: Res, resveratrol.