Research Article
Optimization of Keratin Hydrolysate Extraction from Tannery Sheep Hair Waste
Table 3
Total nitrogen and protein content determination using the Kjeldahl method.
| Run no | 0.1 NHCl consumed average ± SD | % Nitrogen content average ± SD | % Protein content average ± SD |
| Acid titration to determine nitrogen | 1 | 101.5 ± 2.0 | 14.2 ± 0.3 | 88.9 ± 7.2 | 2 | 98.8 ± 2.6 | 13.8 ± 0.4 | 86.6 ± 2.2 | 3 | 97.3 ± 2.5 | 13.6 ± 0.3 | 85.2 ± 1.9 | 4 | 95.2 ± 2.8 | 13.3 ± 0.6 | 83.3 ± 3.5 | 5 | 100.0 ± 2.5 | 14.0 ± 1.5 | 87.5 ± 9.1 | 6 | 81.3 ± 2.9 | 11.4 ± 1.4 | 71.2 ± 8.8 | 7 | 96.2 ± 2.8 | 13.5 ± 0.7 | 84.2 ± 4.6 | 8 | 104.5 ± 1.0 | 14.6 ± 0.4 | 91.5 ± 2.3 | 9 | 99.8 ± 1.9 | 14.0 ± 0.2 | 87.4 ± 1.5 | 10 | 98.0 ± 2.2 | 13.7 ± 0.4 | 85.8 ± 2.6 | 11 | 99.8 ± 2.9 | 14.0 ± 0.5 | 87.4 ± 2.8 | 12 | 102.2 ± 2.5 | 14.3 ± 0.7 | 89.4 ± 4.16 | 13 | 93.7 ± 2.8 | 13.1 ± 0.7 | 82.0 ± 4.4 | 14 | 98.5 ± 3.0 | 13.8 ± 1.0 | 86.2 ± 6.5 | 15 | 86.3 ± 1.0 | 12.1 ± 0.4 | 75.6 ± 2.5 | 16 | 91.7 ± 1.8 | 12.8 ± 0.8 | 80.3 ± 5.2 | 17 | 101.2 ± 2.5 | 14.2 ± 0.4 | 88.6 ± 2.3 | 18 | 102.3 ± 1.8 | 14.3 ± 0.6 | 89.6 ± 3.7 | 19 | 92.7 ± 6.7 | 13.0 ± 1.0 | 81.2 ± 6.3 | 20 | 96.8 ± 2.6 | 13.6 ± 0.4 | 84.8 ± 2.3 |
|
|