Table 1 Experimental matrix and response values from randomized runs in the Packett-Burman test
Run | Code variable level | Real variable level (g/L) | Inhibition rate (%) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
A | B | C | D | E | Yeast extract | corn flour | beef extract | peptone | MgSO4 | ||
1 | 1 | 1 | 1 | − 1 | 1 | 10 | 10 | 15 | 10 | 15 | 86.30 |
2 | − 1 | 1 | − 1 | − 1 | − 1 | 5 | 10 | 10 | 10 | 10 | 77.50 |
3 | 1 | 1 | − 1 | 1 | 1 | 10 | 10 | 10 | 15 | 15 | 85.20 |
4 | − 1 | 1 | 1 | − 1 | 1 | 5 | 10 | 15 | 10 | 15 | 85.60 |
5 | 1 | − 1 | 1 | − 1 | − 1 | 10 | 5 | 15 | 10 | 10 | 80.50 |
6 | − 1 | − 1 | − 1 | 1 | 1 | 5 | 5 | 10 | 15 | 15 | 76.60 |
7 | 1 | 1 | − 1 | 1 | − 1 | 10 | 10 | 10 | 15 | 10 | 81.60 |
8 | − 1 | 1 | 1 | 1 | − 1 | 5 | 10 | 15 | 15 | 10 | 81.20 |
9 | 1 | − 1 | − 1 | − 1 | 1 | 10 | 5 | 10 | 10 | 15 | 78.90 |
10 | − 1 | − 1 | − 1 | − 1 | − 1 | 5 | 5 | 10 | 10 | 10 | 74.50 |
11 | 1 | − 1 | 1 | 1 | − 1 | 10 | 5 | 15 | 15 | 10 | 79.80 |
12 | − 1 | − 1 | 1 | 1 | 1 | 5 | 5 | 15 | 15 | 15 | 77.20 |