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Variables employed in Box–Behnken design.
| Independent variable/factor | Levels | ||
|---|---|---|---|
| −1 | 0 | 1 | |
| X1: wall material dosage (%) | 3 | 4 | 5 |
| X2: emulsifier dosage (%) | 2 | 3 | 4 |
| X3: stirring speed (r/min) | 200 | 250 | 300 |
| Dependent variable/response | Constraints | ||
| Y: Encapsulation rate (%) | Maximize | ||
