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Levels and code of variables chosen for the central composite design.
| Factors | Code | Range and Levels | ||||
|---|---|---|---|---|---|---|
| −1.732 | −1 | 0 | 1 | 1.732 | ||
| egg lecithin | A | 1 | 1.11 | 1.25 | 1.39 | 1.5 |
| Poloxamer 188 | B | 0.1 | 0.21 | 0.35 | 0.49 | 0.6 |
| Soybean oil/oil phase | C | 0 | 10.57 | 25.00 | 39.43 | 50 |
