CZostridium propionicum evidently possesses a mechanism for the conversion of lactate to propionate different from that found in the previously studied propionic acid producing bacteria. Reactions common to certain propionibacteria and VeiZZoneZZa gazogenes which could not be demonstrated with Cl. propionicum include : ( a ) the decarboxylation of succinic acid ; (b) the fermentation of malate ...

This study revealed long-chain fatty acids(LCFAs) on propionic acid production by lipid anaerobic acidogenesis. Oleic and palmitic acid, the two most common LCFAs, were added into acidogenic system to evaluate LCFAs type concentration capacity. The results showed that when of oleic was 4 g/L, content volatile acids(VFAs) 1.3 times higher than blank group(propionic main product, >70%). In contra...

Elsden (1945) has shown that the volatile acids in the rumen fluid of sheep are chiefly acetic, propionic, and butyric. Barcroft, MoAnally, and Phillipson (1944) showed that the concentration of volatile acids in the blood draining the rumen was higher than that in the entering blood, indicating absorption from the rumen. Elsden postulated that propionic acid did not arise directly in cellulose...

The effect of the addition of 2, 3, 5, 7 and 10% respectively of propionic acid on known numbers of bacteria added to or contained in carcass meal was examined. Escherichia coli was totally inhibited by 2% propionic acid, while 5% of the acid both inhibited Salmonella typhimurium and brought about a 74,7% reduction in the total aerobic bacterial count.