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Clostridium difficile ATCC 43255 fermented less than 10% of the mannitol in a medium at pH 7; however, when the initial pH of the medium was adjusted to 8.5 or 9, about 80% of the mannitol was fermented. Cell extracts of C. difficile phosphorylated mannitol with phosphoenolpyruvate, not ATP, indicating a phosphoenolpyruvate phosphotransferase system transport phosphorylation of mannitol. The phosphorylation product was dehydrogenated by D-mannitol-1-phosphate:NAD oxidoreductase. Growth at an initial pH of 8.5 yielded cytotoxin titers of 10(7) to 10(8) in Trypticase-yeast extract-mannitol medium, wit a titer of 10(8) as early as 13 h.

Enhanced fermentation of mannitol and release of cytotoxin by Clostridium difficile in alkaline culture media