Abstract
Ethanol and methylene chloride extracts of cinnamon were compared for their effect on Helicobacter pylori growth
and urease activity. Methylene chloride extract was found to inhibit growth of H. pylori, while ethanol extract
counteracted its urease activity. Cinnamon extract (from methylene chloride) inhibited H. pylori at concentration
range of common antibiotics. Complete inhibition in vitro was achieved by 50 mg:ml in solid medium (egg yolk
emulsion agar) and by 15 mg:ml in liquid medium (supplemented brain heart infusion broth). The cinnamon extracts
were more inhibitory on free urease than on whole cell urease. © 1999 Elsevier Science Ireland Ltd. All rights
reserved.