Solid-State Fermentation of Aspergillus niger to Optimize Extraction Process of Isoliquiritigenin from Glycyrrhiza uralensis

Table 1

Box–Behnken experimental design.

Run	Factor A (pH)	Factor C (solid-liquid ratio) (g/mL)	Factor B (inoculation amount of A. niger)
1	5	3	1.25 × 10^6
2	4	2	1.25 × 106
3	4	1	5 × 10^5
4	3	1	1.25 × 10^6
5	4	3	5 × 10^5
6	5	2	2 × 10^6
7	4	2	1.25 × 10^6
8	4	2	1.25 × 10^6
9	3	2	2 × 10^6
10	5	2	5 × 10^6
11	4	3	2 × 10^6
12	4	2	1.25 × 10^6
13	3	3	1.25 × 10^6
14	4	1	2 × 10^6
15	4	2	1.25 × 10^6
16	5	1	1.25 × 10^6
17	3	2	5 × 10^5