Intestinal peptidase content of the mucous coat of the small intestine in dogs

The content of leucine aminopeptidase, cathepsins B and D was measured in the mucous coating of the small intestine and duodenal juice of adult fistula dogs. It was shown that inhibitory assay was mandatory for measuring the content of intestinal peptidases. The authors discuss the possibility of hydrolysis of food substrates in the parietal layer of the mucous coating by proteolytic enzymes of both intestinal and pancreatic origin.