Table 4.

Compositions of various nitrogen-containing sources

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

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