Protein content of gastric juice

EDITORIAL SYNOPSIS Initially it is demonstrated that the biuret method is an accurate method of determining protein concentration when the protein has been subjected to varying degrees of acid hydrolysis and peptic digestion. Using continuous gastric suction, and the biuret method of measur- ing protein concentration, the protein content of gastric juice in a series of conditions was deter- mined. Gastric cancer patients have a higher basal protein concentration than control subjects and duodenal ulcer patients and gastric ulcer patients have a higher protein concentration than duodenal ulcer patients. In stimulated gastric juice, duodenal ulcer patients have a lower protein concentration than gastric ulcer and gastric carcinoma patients and control subjects. The basal protein outputs were similar in the four groups studied.