Table 1. Values of the independents variables added to films as experimental design.
| Film formulations | Coded values | Real values (%) | ||
| ERP (X1) | CNCs (X2) | ERP (X1) | CNCs (X2) | |
| F1 | –1.00 | –1.00 | 0.50 | 0.15 |
| F2 | –1.00 | +1.00 | 0.50 | 0.85 |
| F3 | +1.00 | –1.00 | 0.90 | 0.15 |
| F4 | +1.00 | +1.00 | 0.90 | 0.85 |
| F5 | –1.41 | 0.00 | 0.40 | 0.50 |
| F6 | +1.41 | 0.00 | 1.00 | 0.50 |
| F7 | 0.00 | –1.41 | 0.70 | 0.00 |
| F8 | 0.00 | +1.41 | 0.70 | 1.00 |
| F9 a | 0.00 | 0.00 | 0.70 | 0.50 |
| F10 a | 0.00 | 0.00 | 0.70 | 0.50 |
| F11 a | 0.00 | 0.00 | 0.70 | 0.50 |
a
central points; ERP = extract of red propolis; CNCs = licuri cellulose nanocrystals.