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Factorial plan for microemulsions with three independent variables and three levels of variation, coded for each factor; and dependent variables for study of the optimization process.
| Factor | Variable | Low (−1) | Medium (0) | High (+1) |
|---|---|---|---|---|
| X1 | Tween 80/PG (%) | 20 | 30 | 40 |
| X2 | Lecithin (%) | 0.1 | 0.3 | 0.5 |
| X3 | Oil (%) | 1 | 1.5 | 2 |
