EN
Methanol, formaldehyde, and sodium formate effects on pepsin preparation and gastric juice pepsin activities were determined. Sodium formate is the strongest inhibitor of pepsin, formaldehyde is a weaker one, and the weakest is methanol. Pepsin inactivation degree increases together with the elevation of concentrations of the examined compounds. Gastric juice pepsin is less susceptible to compounds inhibitory activity than the purified preparation of the enzyme.