Research Article
Production of Proteolytic Enzymes by a Keratin-Degrading Aspergillus niger
Table 4
Main effects and interaction analysis for keratinase production by A. niger growing on feather meal.
| Factors | Effect keratinase | Standard error | t value | P value |
| Medium | 0.702720 | 0.063294 | 11.10241 | 0.001566* | Feather meal (L) | −0.045272 | 0.089646 | −0.50501 | 0.648314 | Feather meal (Q) | −0.369430 | 0.100496 | −3.67606 | 0.034853* | pH (L) | 0.959379 | 0.089646 | 10.70186 | 0.001744* | pH (Q) | 0.387574 | 0.100496 | 3.85660 | 0.030803* | Feather meal × pH | −0.130000 | 0.126590 | −1.02694 | 0.380013 |
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*Significant factors, .
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