The B-Vitamin Requirements of the Propionibacteria

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Abstract
5 of 9 Propioni-bacteria investigated developed satisfactorily in an essentially synthetic medium containing B-vitamins. All of these 5 strains required pantothenic acid and 4 required also biotin. Nicotinic acid, riboflavin, pyridoxin, inositol and folic acid were neither essential nor stimulatory. Response to thiamin and p-aminobenzoic acid was irregular. P. pentosaceum, P. rubrum, P. zeae and P. arabinosum, which failed to grow in the synthetic, B-vitamin medium, required an unidentified factor (or factors) present in yeast extract.