Note on the amino-acids present in phosphopeptone

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Abstract
Reinvestigation of phosphopeptones prepared from caseinogen by tryptic hydrolysis leads to the conclusion that serine is the only hydroxyamino-acid present. Iso-leucine was isolated from a peptone containing in all 10 amino-acid residues. Formulae agreeing with the exptl. data could be deduced for this and for the original phosphopeptone of 9 amino-acid units as follows: N10 peptone: 5 glutamic acid + 1 iso-leucine + 4 serine + 3 HPO3 N9 peptone: 5 glutamic acid + 4 serine 4-3 HPO3. Phosphopeptones of different composition will probably be produced as a result of employing different agents (e.g., pepsin, trypsin, acids, etc.) for the hydrolysis of the caseinogen.

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