Optimization of Extraction Process of Methyl Eugenol and Asarinin in Asarum with Deep Eutectic Solvent Based on the Response Surface Methodology

Table 3

Test factors and level design of response surface methodology.

Factors	Level
	−1	0	1
A. Molar ratio	1 : 2	1 : 3	1 : 4
B. DES volume (mL)	1	1.5	2
C. Ultrasonic temperature (°C)	50	60	70
D. Ultrasonic time (min)	20	30	40