Table 5 Independent variables and levels established through the central composite design for nuts roasting conditions
Independent variables | Independent variables level | ||||
|---|---|---|---|---|---|
Low | Medium | High | Axial (−α) | Axial (+α) | |
Roasting temperature (°C) | 100.0 | 140.0 | 180.0 | 74.68 | 205.32 |
Roasting time (min) | 5.0 | 17.5 | 30.0 | −2.91 | 37.91 |
pH | 5.0 | 6.0 | 7.0 | 4.367 | 7.633 |