Effect of normal C10:0-C20:0 fatty acids and their related compounds on gastric secretion and experimental ulceration in rats.

Fatty acids of C10:0, C12:0, C13:0, C14:0 and C16:0 significantly inhibited the amount of gastric juice, total acid output, and total peptic activity, but fatty acids of C17:0-C20:0 entirely failed to show significant inhibitory activity. Only the methyl ester of C14:0 showed significant inhibition of these parameters at the dose of 100 mg/kg, while at the dose of 200 mg/kg, methyl esters of fatty acids of fatty acids of C10:0, C12:0, C14:0, and C16:0 significantly inhibited these three parameters. alpha-Monoglyceride of C14:0 significantly inhibited the amount of gastric juice at the dose of 100 mg/kg, while alpha-monoglycerides of C10:0, C12:0', C13:0, C14:0, and C16:0 significantly inhibited the amount of gastric juice, total acid output, and total peptic activity at the dose of 200 mg/kg. In the case of intraduodenal administration, myristic acid also showed significant inhibition of these parameters at 100 and 200 mg/kg doses. The dose-activity correlation in gastric secretion inhibitory activity was examined with myristic acid and this activity was found to increase with increasing dose of the acid administered. Myristic acid significantly decreased the ulcer index in aspirin-induced ulcer, it was entirely ineffective in preventing histamine-induced ulcer. Finally, inhibitory effect of myristic acid on pepsin and histidine decarboxylase was examined in vitro and it was found that myristic acid inhibited peptic activity, but it had almost no effect of inhibiting the histidine decarboxylase activity.