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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
  1. The values were calculated based on the nitrogen contents of BD Bionutrients™ Technical Manual Third edition (http://www.bd.com/ds/technicalCenter/misc/lcn01558-bionutrients-manual.pdf). Total amino acids include forms of protein and peptide