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Observations on Protein Digestion in vivo

V. Free Amino Acids in Blood Plasma of Rats Force-Fed Zein, Casein, or Their Respective Hydrolyzates¹

Department of Biochemistry, University of Wisconsin, Madison, Wisconsin

Concentrations of free amino acids in the portal and systemic blood plasma of rats force-fed zein, casein, or their respective hydrolyzates were determined in an effort to show a relationship between the change in plasma amino acid pattern and the relative digestibility of the proteins. Force-feeding zein had little effect on the concentrations of free amino acids in the portal and systemic plasma but force-feeding casein caused a substantial increase in the concentrations of free amino acids in the portal plasma. When hydrolyzates of these proteins were force-fed, much larger increases in the plasma free amino acid concentrations were observed with the largest responses occurring after ingestion of casein hydrolyzate.

² Present address: McArdle Institute for Cancer Research, University of Wisconsin, Madison, Wisconsin.

³ Present address: Department of Nutrition and Food Science, Massachusetts Institute of Technology, Cambridge, Massachusetts.

Manuscript received 5 December 1962.