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Hydrogen (H2) catabolism in the colon of the rat.

Abstract The present study was prompted by the observation that neomycin-treated rats excreted markedly increased quantities of H 2 , a bacterial fermentation product. Recovery studies of H 2 and He instilled into the cecum showed that H 2 was rapidly catabolized. This catabolism was attributed to bacteria since it was not observed in germ-free rats and it was partially inhibited by neomycin or carbon monoxide. Thus, intestinal bacteria both produce and consume H 2 and neomycin appears to selectively inhibit H 2 consumption. Bacterial gas catabolism represents a previously unrecognized factor influencing the volume of intestinal gas. In addition, this study illustrates that normal colonic function may depend upon the metabolism of the normal flora as well as the absence of pathogens.