Research Article
Production of Proteolytic Enzymes by a Keratin-Degrading Aspergillus niger
Table 2
Experimental design and results of the 22 factorial design.
| Run | (concentration, g/L) | (pH) | (proteolytic activity U/mL) | (keratinolytic activity U/mL) |
| 1 | −1 (10) | −1 | 2.25 | 0 | 2 | −1 (10) | +1 (7) | 0.38 | 1.19 | 3 | +1 (30) | −1 | 3.69 | 0.29 | 4 | +1 (30) | +1 (7) | 4.32 | 1.22 | 5 | 0 (20) | 0 (5) | 10.87 | 0.54 | 6 | 0 (20) | 0 (5) | 10.36 | 0.84 | 7 | 0 (20) | 0 (5) | 12.03 | 0.75 | 8 | 0 (20) | 0 (5) | 10.80 | 0.68 | 9 | 0 (20) | −1.41 (2.20) | 4.17 | 0.52 | 10 | 0 (20) | + 1.41 (7.80) | 1.12 | 1.73 | 11 | −1.41 (6) | 0 (5) | 3.73 | 0.55 | 12 | +1.41 (34) | 0 (5) | 11.77 | 0.20 |
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