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- W1912641966 abstract "During the batch degradation of sodium propionate by the anaerobic sludge from an industrial digestor, we observed a significant amount of butyrate formation. Varying the initial propionate concentrations did not alter the ratio of maximal butyrate accumulation to initial propionate concentration within a large range. By measuring the decrease in the radioactivity of [1- 14 C]butyrate during propionate degradation, we estimated that about 20% of the propionate was converted to butyrate. Labeled butyrate was formed from [1- 14 C]propionate with the same specific radioactivity, suggesting a possible direct pathway from propionate to butyrate. We confirmed this hypothesis by nuclear magnetic resonance studies with [ 13 C]propionate. The results showed that [1- 13 C]-, [2- 13 C]-, and [3- 13 C]propionate were converted to [2- 13 C]-, [3- 13 C]-, and [4- 13 C]butyrate, respectively, demonstrating the direct carboxylation on the carboxyl group of propionate without randomization of the other two carbons. In addition, we observed an exchange reaction between C-2 and C-3 of the propionate, indicating that acetogensis may proceed through a randomizing pathway. The physiological significance and importance of various metabolic pathways involved in propionate degradation are discussed, and an unusual pathway of butyrate synthesis is proposed." @default.
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- W1912641966 date "1988-02-01" @default.
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- W1912641966 title "Reductive Carboxylation of Propionate to Butyrate in Methanogenic Ecosystems" @default.
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- W1912641966 doi "https://doi.org/10.1128/aem.54.2.441-445.1988" @default.
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