Protein Digestion and Absorption by the Entire Gastro-Intestinal Tract in Man.

摘要

Digestion of egg albumin by the human gastro-intestinal tract was studied in 15 adult Chinese males using the oral lavage method. Fractions of oral protein load digested were significantly greater in subjects allowed two hours digestion time (mean, 45%) than those given only one hour for digestion (32%). Furthermore, subjects showed greater digestion of the cooked albumin than the raw protein, 91% versus 36% digestion. The fraction of test protein digested was significantly greater in younger subjects than in older ones, 47 and 32%, respectively, with one hour digestion time. Renal clearances of amino acids are close to 1ml/min although for histidine, glycine and tryptophan are greater than 3ml/min. Amino acid clearances by the gastro-intestinal tract are about 10 times higher than the renal clearances.