Table 1.
Values of the independent parameters and their coded forms with their symbols employed in RSM for optimization of olive leaf extraction using water.
| Independent Parameters | Symbols of the Parameters | Original Values of the Parameters | Parameter Coded Forms * |
|---|---|---|---|
| Temperature (°C) | X1 | 70 | − |
| 80 | 0 | ||
| 90 | + | ||
| Time (min) | X2 | 50 | − |
| 60 | 0 | ||
| 70 | + | ||
| Ratio (mg/mL) | X3 | 10 | − |
| 55 | 0 | ||
| 100 | + |
* Parameter coded forms −, 0 and + are the minimum point, centre point and maximum point (respectively) for the independent parameters temperature, time and ratio.