Table 4 Compositions of various nitrogen-containing sources
From: Ammonia production from amino acid-based biomass-like sources by engineered Escherichia coli
Nitrogen source | Total nitrogen [TN, % (w/w)] | Amino nitrogen [AN, % (w/w)] | AN/TN (%) | Total amino acids [% (w/w)] | Free amino acids [% (w/w)] | Free amino acids/total amino acids (%) |
|---|---|---|---|---|---|---|
Yeast extract | 10.9 | 6.0 | 55.0 | 52.2 | 32.8 | 62.8 |
Tryptone | 13.3 | 5.3 | 39.8 | 76.4 | 26.9 | 35.2 |
Peptone | 15.4 | 3.5 | 22.7 | 72.4 | 14.8 | 20.4 |
Casamino acids | 10.8 | 9.4 | 87.0 | 62.8 | 51.0 | 81.2 |