Table 6.
Values and coded levels of factors.
| Factors | Coded Factor Level | ||||
|---|---|---|---|---|---|
| – | a | 0 | A | + | |
| Concentration (mg/mL) | 10 | 10 | 20 | 30 | 30 |
| pH | 3 | 3 | 6 | 9 | 9 |
| Temperature (°C) | 25 | 25 | 32.5 | 40 | 40 |
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