Table 5.
Factors and levels of DoE independent variables
| Factors | Levels | ||||
|---|---|---|---|---|---|
| − 1.68 | − 1 | 0 | 1 | 1.68 | |
| TH (mg/mL) | 1.16 | 1.5 | 2.0 | 2.5 | 2.84 |
| TW (mg/mL) | 1.32 | 2.0 | 3.0 | 4.0 | 4.68 |
| pH | 4.32 | 5.5 | 6.0 | 6.5 | 7.68 |
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