Abstract
The Clostridium butyricum-Clostridium beijerinckii group, which was isolated from human feces, assimilated pectic acid and 4, 5-unsaturated digalacturonic acid. Acetic acid and small amounts of n-butyric acid and formic acid were produced from pectic acid, and acetic acid and formic acid were produced from 4, 5-unsaturated digalacturonic acid. Pectic acid was degraded to acetic acid via 4, 5-unsaturated digalacturonic acid. Little galacturonic acid was used as a carbon source by this bacterium and alginic acid was not used. The other anaerobic intestinal bacteria tested produced a large amount of acetic acid and small amount of n-butyric acid from pectic acid, and the acetic acid produced was 35-42% carbon equivalents.
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