A Study of the Ionic Liquid-Based Ultrasonic-Assisted Extraction of Isoliquiritigenin from Glycyrrhiza uralensis

Table 1

The Box-Behnken experimental design.

Run	Factor A; Concentration of [BMIM]Br; (mol/L)	Factor B; Extraction time; (min)	Factor C; Solid-liquid ratio; (g/mL)
1	0.2	90	1 : 15
2	0.2	90	1 : 15
3	0.2	120	1 : 10
4	0.3	90	1 : 10
5	0.1	60	1 : 15
6	0.2	60	1 : 10
7	0.3	90	1 : 20
8	0.1	120	1 : 15
9	0.2	60	1 : 20
10	0.2	90	1 : 15
11	0.2	90	1 : 15
12	0.3	60	1 : 15
13	0.2	120	1 : 20
14	0.1	90	1 : 10
15	0.2	90	1 : 15
16	0.1	90	1 : 20
17	0.3	120	1 : 15