Table 1 Response surface design scheme.
Experimental groups | A | B | C | Extraction rate/% |
|---|---|---|---|---|
1 | 70 | 30 | 70 | 1.177 |
2 | 80 | 30 | 60 | 1.175 |
3 | 70 | 50 | 70 | 1.170 |
4 | 60 | 40 | 50 | 1.154 |
5 | 80 | 40 | 50 | 1.163 |
6 | 70 | 40 | 60 | 1.183 |
7 | 60 | 30 | 60 | 1.164 |
8 | 70 | 40 | 60 | 1.180 |
9 | 70 | 40 | 60 | 1.172 |
10 | 70 | 40 | 60 | 1.181 |
11 | 70 | 30 | 50 | 1.173 |
12 | 70 | 50 | 50 | 1.166 |
13 | 60 | 40 | 70 | 1.153 |
14 | 80 | 50 | 60 | 1.166 |
15 | 80 | 40 | 70 | 1.165 |
16 | 60 | 50 | 60 | 1.153 |
17 | 70 | 40 | 60 | 1.175 |
