Table 1 The levels and codes of fermentation variables used in Box-Behnken design (BBD)
Variables | Coded symbols | Coded levels | ||
|---|---|---|---|---|
-1 | 0 | 1 | ||
Fermentation temperature (oC) | A | 28 | 30 | 32 |
Fermentation time (d) | B | 2 | 3 | 4 |
Ratio of water to raw material (%) | C | 10 | 12 | 14 |
Variables | Coded symbols | Coded levels | ||
|---|---|---|---|---|
-1 | 0 | 1 | ||
Fermentation temperature (oC) | A | 28 | 30 | 32 |
Fermentation time (d) | B | 2 | 3 | 4 |
Ratio of water to raw material (%) | C | 10 | 12 | 14 |