[Evaluation of the antacid properties of Gelox in a dynamic milieu using the artificial stomach apparatus].

Gelox antacid activity has been evaluated in a dynamic procedure by using the "artificial stomach" model that mimics both gastric fluxes, gastric secretion and gastric emptying. At time 0, the gastric reservoir has been filled by 100 ml of 0.1 N hydrochloric acid solution without or with protein, or by 100 ml of human gastric juice (pH 1.1). Gastric secretion was simulated by a constant 3 ml/min flux of HCl solution or of human gastric juice. Gastric emptying fluxes varied from 1.5 to 4.5 ml/min. Gelox addition to 100 ml of 0.1 N HCl or of human gastric juice induced 1) a pH-rise from 1.0 to 4.5-5.8, 2) a buffering capacity close to pH 3.6-4.0 and 3) the consumption of an acid amount between 25 and 50 mmol according to emptying fluxes, for recovering initial pH. In a mixture of HCl 0.1 N and protein extract 1 or 5%, Gelox induced 1) a pH-rise related to the protein concentrations, 2) a buffering capacity close to pH 3.2-3.9 when 1% protein extract has been used, and close to pH 5.0-5.9 with 5% protein extract and 3) a greater acid consumption with 1% than with 5% protein extract. For both protein concentrations, the resistance for recovering the initial pH, expressed as the amount of consumed mmol H+, was therefore less than the sum of individual capacities of proteins and Gelox.(ABSTRACT TRUNCATED AT 250 WORDS)