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Process variables and their levels used in CCD
| |
|
Levels |
||||
|---|---|---|---|---|---|---|
| Independent variables | Coded symbols | -2 -1 0 1 2 | ||||
| Temperature (°C) |
A(X1) |
30 |
40 |
50 |
60 |
70 |
| Molar ratio (D-isoascorbic: palmitic acid) |
B(X2) |
1:1 |
1:2 |
1:3 |
1:4 |
1:5 |
| Enzyme load (w/w) |
C(X3) |
0.5 |
5 |
9.5 |
14 |
18.5 |
| Ultrasonic power (W) | D(X4) | 60 | 90 | 120 | 150 | 180 |
