THE CONJUGATED, NON-PROTEIN, AMINO ACIDS OF PLASMA. IV. A DIFFERENCE IN THE UTILIZATION OF THE PEPTIDES OF HYDROLYSATES OF FIBRIN AND CASEIN

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Abstract
Although the earlier conclusion of the authors was confirmed that peptides were less readily utilized than free amino acids when partial hydrolysates of protein were administered intravenously, the peptides of a fibrin hydrolysate were lost into the urine to a distinctly smaller extent than were the peptides of an enzymatic casein hydrolysate. Total amino acid losses of the 2 hydrolysates were similar. One may conclude that any partial hydrolysate of protein for intraven. nutrition offers the possibility of quantitatively or qualitatively serious losses of bound amino acids.