Table 1.
Coded values of independent variables.
| Variables | Symbol Codes | Levels | ||
|---|---|---|---|---|
| 1 | 0 | −1 | ||
| Microwave time (min) | A | 10 | 13 | 16 |
| Ultrasonic time (min) | B | 5 | 15 | 25 |
| Particle size (mesh) | C | 80 | 100 | 120 |
| Ratio of liquid to solid (mL/g) | D | 40 | 55 | 70 |
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