Development and use of a chemically defined medium for estimating the oxygen tolerance of campylobacter species
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To eliminate such variation in complex media, we developed a chemically defined medium for Campylobacter spp. This medium allows reproducible colony counts to be obtained. The medium was used to assess the effect of ROI scavengers on the oxygen tolerance of various Campylobacter species. Allopurinol, azelaic acid, caffeine, cimetidine, and pyruvate when used singly were the most effective in enhancing oxygen tolerance. When ROI scavengers were combined with dimethyl sulfoxide, the effects of allopurinol, azelaic acid, caffeine, cimetidine, and pyruvate were even more pronounced than when they were used alone. A combination of tetramethylpiperidine-1-oxyl (1EMPOL), a superoxide dis mutase mimic, with pyruvate also enhanced oxygen tolerance effectively. A survey of the literature dealing with the types of ROIs destroyed by scavengers used in our study suggests that hydrogen peroxide (H202) and hydroxyl radicals (OH.) are the most toxic ROIs for Campylobacter species.
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