Effect of Aldehydes and Fatty Acids as Added Hydrogen Acceptors on the Fermentation of Glucose by Aerobacter indologenes

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Abstract
Acetic and propionic acids when added to glucose fermentations by A. indologenes are reduced, resulting in a decrease in gaseous hydrogen and an increase in 2,3-butylene glycol. Propionic acid is reduced to propyl alcohol with a decrease in ethyl alcohol. Acetalde-hyde undergoes an equimolar conversion to ethyl alcohol and acetic acid when added to an alkaline glucose fermentation; when added to a fermentation with a reaction favorable for the formation of butylene glycol, increases in acetyl-methylcarbinol, ethyl alcohol and acetic acid are noted, with a decrease in the yield of H2. Propionaldehyde and butyraldehyde are reduced to the corresponding alcohols under similar conditions, some of the butyraldehyde was recovered as butyric acid. No decrease in H2 was noted and small amts. of succinic acid were found along with decreases in ethyl alcohol. There was no increase in butylene glycol or acetylmethylcarbinol with either propionaldehyde or butyraldehyde. Fumaric acid is reduced to succinic acid and some of the glucose carbon is also diverted to succinic acid with a decrease in ethyl alcohol but no increases in 4-carbon neutral compounds. In neither case were homologs of acetylmethylcarbinol or butylene glycol formed.

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