Optimized conditions for growth and fermentation of Helicobacter pylori.

This study attempted to optimize the growth conditions of Helicobacter pylori by comparing the growth of H. pylori in an anaerobic jar and an incubator. It was found that the primary isolation rate of H. pylori from gastric biopsies was higher in an anaerobic incubator (28/30) than in an anaerobic jar (21/30). In addition, growth rate in the subsequent passage was also higher in an incubator. By comparing different supplements in the liquid media, it was found that most strains grew best in Brucella broth containing 5% fetal calf serum, and some strains grew well with the supplement of 0.2% of beta-cyclodextrin. A large scale culture using a bioreactor indicated that a defoaming agent, polypropylenglycol, profoundly inhibited the growth of H. pylori. However, fermentation could be successfully performed by continuously infusing mixed airs composed of 5% O2, 10% CO2 and 85% N2. Moreover, the production of secreted proteins of H. pylori strains grown in the bioreactor was the same as that in an anaerobic jar. Results presented herein can be used to further optimize conditions for enhancing the growth of H. pylori.