Table 1 Optimalization of physical parameters for the protein yeast biomass production: independent variables in a 22 full factorial experiment design
Independent factor | Actual factor level at coded factor level of | |||
|---|---|---|---|---|
Symbol | − 1 | 0 | 1 | |
Temperature (°C) | X1 | 20.0 | 25 | 30 |
pH | X2 | 5.0 | 6.0 | 7.0 |