Table 4 Actual and coded level of variables tested with Box-Behnken design for α-L-arabinofuranosidase production
Process variable | Coded level of variable | ||
|---|---|---|---|
−1 | 0 | +1 | |
Urea (X1) | 0.1 | 2.55 | 5 |
MgSO4 (X2) | 0.1 | 1.55 | 3 |
CaCl2 (X3) | 0.1 | 1.55 | 3 |
pH (X4) | 3 | 5.5 | 8 |
Ammonium sulfate (X5) | 1 | 5.5 | 10 |
Fermentation time (X6) | 48 | 132 | 216 |