Table 2.
Independent variables and levels used for Box–Behnken design.
| Independent variables | Symbol coded | Levels | ||
|---|---|---|---|---|
| −1 | 0 | +1 | ||
| Glucose | A | 5 | 10 | 15 |
| Yeast extract | B | 20 | 25 | 30 |
| MgSO4 | C | 10 | 15 | 20 |
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