Table 1. Factors and their levels in our central composite design (CCD).
Actual factor (Coded factor) | Actual factor level corresponding to the coded factor level | ||||
---|---|---|---|---|---|
2.366 | −1 | 0 | 1 | 2.366 | |
Peptone soy (X1) (% [w/v]) | 0.000 | 1.155 | 2.000 | 2.845 | 4.000 |
Yeast extract (X2) (% [w/v]) | 0.000 | 1.155 | 2.000 | 2.845 | 4.000 |
Glucose (X3) (% [w/v]) | 0.000 | 0.577 | 1.000 | 1.423 | 2.000 |
L-cystein (X4) (% [w/v]) | 0.000 | 0.289 | 0.500 | 0.711 | 0.100 |
Ferrous sulfate (X5) (% [w/v]) | 0.000 | 0.006 | 0.010 | 0.014 | 0.020 |