Intestinal Absorption of Histidine as Influenced by Tryptophan in the Rat.

Abstract

The Cori technic was used. The amino acids were fed by stomach tube. After a predetermined absorption period, the residual amts. of the amino acids which remained in the gastrointestinal tract were colorimetrically detd. L-Tryptophan decreases the rate of absorption of histidine from the gut. The absorption rate of L-tryptophan does not appear to be affected by the simultaneous presence of histidine, Dl-phenylalanine and L-arginine in the gut. Dl-Phenylalanine and L-arginine did not significantly affect the absorption of either histidine or tryptophan.