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Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Comparison of metabolomic profiles of microbial communities between stable and deteriorated methanogenic processes.
Bioresource Technology 2014 November
Central metabolite profiles from glucose in microbial communities during methanogenic process were compared between a stable methanogenic reactor (MR) and a deteriorated reactor (DR). The concentrations of intracellular metabolites related to the Embden-Meyerhof and pentose phosphate pathways, with the exception of pyruvate, remained high in the MR, showing increased carbon flux in the glycolysis pathway during stable methanogenesis. Extracellular acetate temporarily accumulated in the MR, consistent with higher ATP level in the MR. Intracellular concentrations of the intermediates in the reductive branch of tricarboxylic acid cycle, malate, fumarate, and succinate were higher in the DR. Low NADH/NAD(+) ratio both in the MR and DR would suggest NADH consumption during acetate and lactate/succinate production in the MR and DR, respectively. Intracellular glutamate levels were higher in the MR, correlating with lower NADPH/NADP(+) ratio concentrations in the MR. These findings contribute to a better understanding of the metabolic state during stable methanogenesis.
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