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Experimental design and results of factorial design
| No. | Coded level |
Real values |
Y (%) | ||
| x1 | x2 | X1 (%) | X2 (%) | ||
| 1 | −1 | −1 | 15 | 10 | 63.1 |
| 2 | 1 | −1 | 25 | 10 | 87.8 |
| 3 | −1 | 1 | 15 | 20 | 50.0 |
| 4 | 1 | 1 | 25 | 20 | 76.3 |
| 5 | 0 | 0 | 20 | 15 | 80.5 |
| 6 | 0 | 0 | 20 | 15 | 76.8 |
| 7 | 0 | 0 | 20 | 15 | 79.2 |
| 8 | 0 | 0 | 20 | 15 | 77.5 |
| 9 | 0 | 0 | 20 | 15 | 78.4 |
X 1: Concentration of PEG 2 000, % (w/w); X 2: Concentration of KH2PO4-K2HPO4, % (w/w); Y: Recovery of elastase (%)
