Abstract
In a chemically defined medium under anerobic conditions Lactobacillus plantarum grew on glucose, but was unable to grow with mannitol as the carbon source. Mannitol was a suitable carbon source, provided 1 of 11 compounds (pyruvic acid, α-ketobutyric acid, α-ketovaleric acid, α-ketocaprylic acid, acetic acid, acetyl phosphate, acetaldehyde, citric acid, axoloacetic, malic acid, and fumaric acid) was added to the medium as an electron acceptor. The extent of mannitol fermentation was proportional to the concentration of available electron acceptor. The reduced products of the electron acceptor compounds were identified and possible pathways for the metabolism of electron acceptors were proposed. Strains from two other species of lactobacilli which ferment mannitol appear to use different electron acceptor pathways.
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