Abstract
We were able to study the question of HC1 absorption in man by inducing sufficient duodenal stimu lation to arrest gastric evacuation and by using phenol red as an indicator of that arrest. This was possible because phenol red in concentration of two milligrams per 100 cc. is not absorbed by the human stomach. Hydrochloric acid in concentrations of approximately 0.5% or 1% is not absorbed by the stomach when such solutions are in contact with it for periods up to 30 minutes. Hydrochloric acid meals of 0.5% concentration do not completely inhibit gastric secretion, while 1% meals do cause complete inhibition.
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