Research Article

Production of Proteolytic Enzymes by a Keratin-Degrading Aspergillus niger

Table 5

Experiments for model validation.*

Enzymatic activity
Run**Feather meal (g/L)pHExperimentalPredictedDifference (%)

1266.21.010.991.99
9.0310.9417.46
2306.20.970.889.28
7.928.698.86
3265.00.550.6313.00
11.0411.463.66
4269.02.592.3510.21
0āˆ’9.300

*Models for keratinase and protease production are represented by (2) and (3), respectively (see text).
**The first line for each run shows the keratinolytic activity and the second line the proteolytic activity.