Table 1.
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.