TABLE 1.
Levels and code of extraction variables used in Box–Behnken design
| Variable | Coded levels | ||
|---|---|---|---|
| −1 | 0 | 1 | |
| Exaction temperature (X1,°C) | 20 | 25 | 30 |
| Yeast liquid volume (X2, ml) | 2 | 3 | 4 |
| Exaction time (X3, h) | 16 | 20 | 24 |
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