Optimization of Extract Method for Cynomorium songaricum Rupr. by Response Surface Methodology

Table 2

Independent and dependent variables used in the Box-Behnken design for the optimization of C. songaricum extraction.

Factor	Level used, actual coded
Independent variables	Low (−1)	Medium (0)	High (+1)
X1 = material-to-solvent ratio (g/mL)	1/10	1/20	1/30
X2 = ultrasonic time (min)	20	40	60
X3 = ultrasonic power (W)	60	80	100
Dependent variables			Goal
Y1 = content of gallic acid			Maximize
Y2 = content of protocatechuic acid			Maximize
Y3 = content of catechin			Maximize