Table 1 Independent variables: coded and real value in center composite rotatable design
Variables | Symbols | Levels | ||||
|---|---|---|---|---|---|---|
−1.68 (−α) | −1 | 0 | +1 | +1.68(+α) | ||
Initial water added based on oil weight (wt.%) | A | 0.30 | 2.00 | 4.50 | 7.00 | 8.70 |
Methanol to tung oil molar ratio (mol/mol) | B | 0.98 | 2.00 | 3.50 | 5.00 | 6.02 |
Enzyme concentration based on oil weight (wt.%) | C | 8.3 | 10.00 | 12.50 | 15.00 | 16.70 |