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The ability of bifidobacteria to synthesize six water-soluble vitamins (thiamine, folic acid, nicotinic acid, pyridoxine, vitamin B12 and riboflavin) was systematically investigated with twenty-four strains of five species derived from human feces. The vitamins synthesized were determined as those accumulated in cultures grown in a semi-synthetic medium. For the vitamins other than vitamin B12 and riboflavin, extracellular liberation was also examined with the supernatant fluids obtained after removing cells from the cultures. Many strains of the bifidobacteria investigated could indeed synthesize five of the vitamins, the exception being riboflavin. A large portion of each of the vitamins synthesized was excreted into the medium. The concentrations of the vitamins, especially thiamine, nicotinic acid and folic acid, accumulated varied widely among different species or strains. On the basis of the results, these bifidobacteria could be divided into three general types according to the abilities to accumul...

Comparative studies on synthesis of water-soluble vitamins among human species of bifidobacteria.