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Electron bifurcation mechanism and homoacetogenesis explain products yields in mixed culture anaerobic fermentations

(2018) WATER RESEARCH. 141. p.349-356
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Abstract
Anaerobic fermentation of organic wastes using microbial mixed cultures is a promising avenue to treat residues and obtain added-value products. However, the process has some important limitations that prevented so far any industrial application. One of the main issues is that we are not able to predict reliably the product spectrum (i.e. the stoichiometry of the process) because the complex microbial community behaviour is not completely understood. To address this issue, in this work we propose a new metabolic network of glucose fermentation by microbial mixed cultures that incorporates electron bifurcation and homoacetogenesis. Our methodology uses NADH balances to analyse published experimental data and evaluate the new stoichiometry proposed. Our results prove for the first time the inclusion of electron bifurcation in the metabolic network as a better description of the experimental results. Homoacetogenesis has been used to explain the discrepancies between observed and theoretically predicted yields of gaseous H-2 and CO2 and it appears as the best solution among other options studied. Overall, this work supports the consideration of electron bifurcation as an important biochemical mechanism in microbial mixed cultures fermentations and underlines the importance of considering homoacetogenesis when analysing anaerobic fermentations. (C) 2018 The Authors. Published by Elsevier Ltd.
Keywords
Pollution, Waste Management and Disposal, Water Science and Technology, Ecological Modelling, Environmental Engineering, Civil and Structural Engineering, Electron bifurcation, Acidogenic fermentation, Mixed culture, Homoacetogenesis, Stoichiometry, BIO-HYDROGEN PRODUCTION, FERREDOXIN OXIDOREDUCTASES, PH, GLUCOSE, DIGESTION, ENERGY, MODEL, H-2, CONSUMPTION, BIOENERGY

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MLA
Regueira López, Alberte, et al. “Electron Bifurcation Mechanism and Homoacetogenesis Explain Products Yields in Mixed Culture Anaerobic Fermentations.” WATER RESEARCH, vol. 141, 2018, pp. 349–56, doi:10.1016/j.watres.2018.05.013.
APA
Regueira López, A., González-Cabaleiro, R., Ofiţeru, I. D., Rodríguez, J., & Lema, J. M. (2018). Electron bifurcation mechanism and homoacetogenesis explain products yields in mixed culture anaerobic fermentations. WATER RESEARCH, 141, 349–356. https://doi.org/10.1016/j.watres.2018.05.013
Chicago author-date
Regueira López, Alberte, R. González-Cabaleiro, I.D. Ofiţeru, J. Rodríguez, and J.M. Lema. 2018. “Electron Bifurcation Mechanism and Homoacetogenesis Explain Products Yields in Mixed Culture Anaerobic Fermentations.” WATER RESEARCH 141: 349–56. https://doi.org/10.1016/j.watres.2018.05.013.
Chicago author-date (all authors)
Regueira López, Alberte, R. González-Cabaleiro, I.D. Ofiţeru, J. Rodríguez, and J.M. Lema. 2018. “Electron Bifurcation Mechanism and Homoacetogenesis Explain Products Yields in Mixed Culture Anaerobic Fermentations.” WATER RESEARCH 141: 349–356. doi:10.1016/j.watres.2018.05.013.
Vancouver
1.
Regueira López A, González-Cabaleiro R, Ofiţeru ID, Rodríguez J, Lema JM. Electron bifurcation mechanism and homoacetogenesis explain products yields in mixed culture anaerobic fermentations. WATER RESEARCH. 2018;141:349–56.
IEEE
[1]
A. Regueira López, R. González-Cabaleiro, I. D. Ofiţeru, J. Rodríguez, and J. M. Lema, “Electron bifurcation mechanism and homoacetogenesis explain products yields in mixed culture anaerobic fermentations,” WATER RESEARCH, vol. 141, pp. 349–356, 2018.
@article{8724937,
  abstract     = {{Anaerobic fermentation of organic wastes using microbial mixed cultures is a promising avenue to treat residues and obtain added-value products. However, the process has some important limitations that prevented so far any industrial application. One of the main issues is that we are not able to predict reliably the product spectrum (i.e. the stoichiometry of the process) because the complex microbial community behaviour is not completely understood. To address this issue, in this work we propose a new metabolic network of glucose fermentation by microbial mixed cultures that incorporates electron bifurcation and homoacetogenesis. Our methodology uses NADH balances to analyse published experimental data and evaluate the new stoichiometry proposed. Our results prove for the first time the inclusion of electron bifurcation in the metabolic network as a better description of the experimental results. Homoacetogenesis has been used to explain the discrepancies between observed and theoretically predicted yields of gaseous H-2 and CO2 and it appears as the best solution among other options studied. Overall, this work supports the consideration of electron bifurcation as an important biochemical mechanism in microbial mixed cultures fermentations and underlines the importance of considering homoacetogenesis when analysing anaerobic fermentations. (C) 2018 The Authors. Published by Elsevier Ltd.}},
  author       = {{Regueira López, Alberte and González-Cabaleiro, R. and Ofiţeru, I.D. and Rodríguez, J. and Lema, J.M.}},
  issn         = {{0043-1354}},
  journal      = {{WATER RESEARCH}},
  keywords     = {{Pollution,Waste Management and Disposal,Water Science and Technology,Ecological Modelling,Environmental Engineering,Civil and Structural Engineering,Electron bifurcation,Acidogenic fermentation,Mixed culture,Homoacetogenesis,Stoichiometry,BIO-HYDROGEN PRODUCTION,FERREDOXIN OXIDOREDUCTASES,PH,GLUCOSE,DIGESTION,ENERGY,MODEL,H-2,CONSUMPTION,BIOENERGY}},
  language     = {{eng}},
  pages        = {{349--356}},
  title        = {{Electron bifurcation mechanism and homoacetogenesis explain products yields in mixed culture anaerobic fermentations}},
  url          = {{http://dx.doi.org/10.1016/j.watres.2018.05.013}},
  volume       = {{141}},
  year         = {{2018}},
}

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