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The free amino acids in the gastric juice of patients with gastric and/or duodenal ulcer and gastric carcinoma were collected by means of ion exchange resin and examined by a paper-chromatographic method. 1. In the gastric juice of healthy stomachs occurred 11 free amino acids. The degree of occurrence, however, was of the order of moderate positiveness (+). 2. The gastric juice in cases of gastric and/or duodenal ulcer showed a slight tendency to increase in the number of occurring amino acids, but the degree of strong positiveness (++) occurred in only 1 case. The rate of occurrence after gastrectomy was nearly the same as before operation, but strong positiveness disappeared after gastrectomy. 3. In the gastric juice of gastric carcinoma cases, proline, threonine, and a peptide newly appeared in addition to the amino acids seen in ulcer cases; the degree of occurrence of leucine, valine, alanine, serine and glycine, and glutamic acid was remarkably high. The free amino acids in the remaining stomach after gastrectomy showed, in comparison with those before operation, a pronounced depression in the degree of occurrence; and their state of occurrence became similar to that seen in ulcer cases before operation.

tohoku journal of experimental medicine

Free Amino Acids in Gastric Juice of Patients with Gastric or Duodenal Ulcer and Gastric Carcinoma, with Special Reference to the Change after Operation