Abstract
At various intervals of time following the ingestion of relatively large quantities of peptone, determinations were made in rats of the concentrations of 9 individual free amino acids in femoral muscle, liver, kidney, and spleen. In addition, measurements were made of variations in the individual non-protein bound amino acids of these tissues. The results indicate that the concentrations of individual amino acids within a single tissue undergo independent changes in response to the ingestion of peptone. Supplementation of normal diets with large quantities of dl-methionine resulted in increased concentrations of methionine in plasma and muscle, but lower levels in kidney and liver tissue. Arginine and phenylalanine levels also decreased in kidney. On a diet containing high concentrations of dl-phenylalanine, no significant changes occurred in muscle and liver tissue and in plasma; contrary to what occurred on the high methionine diet, the levels of arginine and phenylalanine rose in the kidneys of fasted rats; kidney methionine concentrations did not change appreciably.
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