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Coded and uncoded independent variables used in response surface optimization
| Variables | Coded levels | ||
|---|---|---|---|
| − 1 | 0 | + 1 | |
| Uncoded levels | |||
| Inoculum amounts of B. subtilis (mL/100 mL) | 1.0 | 2.5 | 4.0 |
| Inoculum amounts of K. marxianus (mL/100 mL) | 1.0 | 2.5 | 4.0 |
| pH | 4.0 | 5.5 | 7.0 |
| Hazelnut shell concentration (%w/v) | 10.0 | 25.0 | 40.0 |
