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Impact of formate on the growth and productivity of Clostridium ljungdahlii PETC and Clostridium carboxidivorans P7 grown on syngas

(2014) INTERNATIONAL MICROBIOLOGY. 17(4). p.195-204
Author
Organization
Abstract
The current energy model based on fossil fuels is coming to an end due to the increase in global energy demand. Biofuels such as ethanol and butanol can be produced through the syngas fermentation by acetogenic bacteria. The present work hypothesizes that formate addition would positively impact kinetic parameters for growth and alcohol production in Clostridium ljungdahlii PETC and Clostridium carboxidivorans P7 by diminishing the need for reducing equivalents. Fermentation experiments were conducted using completely anaerobic batch cultures at different pH values and formate concentrations. PETC cultures were more tolerant to formate concentrations than P7, specially at pH 5.0 and 6.0. Complete growth inhibition of PETC occurred at sodium formate concentrations of 30.0 mM; however, no differences in growth rates were observed at pH 7.0 for the two strains. Incubation at formate concentrations lower than 2.0 mM resulted in increased growth rates for both strains. The most recognizable effects of formate addition on the fermentation products were the increase in the total carbon fixed into acids and alcohols at pH 5.0 and pH 6.0, as well as, a higher ethanol to total products ratio at pH 7.0. Taken all together, these results show the ability of acetogens to use formate diminishing the energy demand for growth, and enhancing strain productivity.
Keywords
Clostridium carboxidivorans, Clostridium ljungdhalii, syngas fermentation, biofuels, formate, BUTYRIBACTERIUM-METHYLOTROPHICUM, ESCHERICHIA-COLI, CARBON-MONOXIDE, ACID RESISTANCE, SP-NOV, FERMENTATION, ETHANOL, CO2, AUTOETHANOGENUM, CONVERSION

Citation

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MLA
Ramio-Pujol, Sara et al. “Impact of Formate on the Growth and Productivity of Clostridium Ljungdahlii PETC and Clostridium Carboxidivorans P7 Grown on Syngas.” INTERNATIONAL MICROBIOLOGY 17.4 (2014): 195–204. Print.
APA
Ramio-Pujol, S., Ganigué, R., Baneras, L., & Colprim, J. (2014). Impact of formate on the growth and productivity of Clostridium ljungdahlii PETC and Clostridium carboxidivorans P7 grown on syngas. INTERNATIONAL MICROBIOLOGY, 17(4), 195–204.
Chicago author-date
Ramio-Pujol, Sara, Ramon Ganigué, Lluis Baneras, and Jesus Colprim. 2014. “Impact of Formate on the Growth and Productivity of Clostridium Ljungdahlii PETC and Clostridium Carboxidivorans P7 Grown on Syngas.” International Microbiology 17 (4): 195–204.
Chicago author-date (all authors)
Ramio-Pujol, Sara, Ramon Ganigué, Lluis Baneras, and Jesus Colprim. 2014. “Impact of Formate on the Growth and Productivity of Clostridium Ljungdahlii PETC and Clostridium Carboxidivorans P7 Grown on Syngas.” International Microbiology 17 (4): 195–204.
Vancouver
1.
Ramio-Pujol S, Ganigué R, Baneras L, Colprim J. Impact of formate on the growth and productivity of Clostridium ljungdahlii PETC and Clostridium carboxidivorans P7 grown on syngas. INTERNATIONAL MICROBIOLOGY. 2014;17(4):195–204.
IEEE
[1]
S. Ramio-Pujol, R. Ganigué, L. Baneras, and J. Colprim, “Impact of formate on the growth and productivity of Clostridium ljungdahlii PETC and Clostridium carboxidivorans P7 grown on syngas,” INTERNATIONAL MICROBIOLOGY, vol. 17, no. 4, pp. 195–204, 2014.
@article{7208383,
  abstract     = {The current energy model based on fossil fuels is coming to an end due to the increase in global energy demand. Biofuels such as ethanol and butanol can be produced through the syngas fermentation by acetogenic bacteria. The present work hypothesizes that formate addition would positively impact kinetic parameters for growth and alcohol production in Clostridium ljungdahlii PETC and Clostridium carboxidivorans P7 by diminishing the need for reducing equivalents. Fermentation experiments were conducted using completely anaerobic batch cultures at different pH values and formate concentrations. PETC cultures were more tolerant to formate concentrations than P7, specially at pH 5.0 and 6.0. Complete growth inhibition of PETC occurred at sodium formate concentrations of 30.0 mM; however, no differences in growth rates were observed at pH 7.0 for the two strains. Incubation at formate concentrations lower than 2.0 mM resulted in increased growth rates for both strains. The most recognizable effects of formate addition on the fermentation products were the increase in the total carbon fixed into acids and alcohols at pH 5.0 and pH 6.0, as well as, a higher ethanol to total products ratio at pH 7.0. Taken all together, these results show the ability of acetogens to use formate diminishing the energy demand for growth, and enhancing strain productivity.},
  author       = {Ramio-Pujol, Sara and Ganigué, Ramon and Baneras, Lluis and Colprim, Jesus},
  issn         = {1139-6709},
  journal      = {INTERNATIONAL MICROBIOLOGY},
  keywords     = {Clostridium carboxidivorans,Clostridium ljungdhalii,syngas fermentation,biofuels,formate,BUTYRIBACTERIUM-METHYLOTROPHICUM,ESCHERICHIA-COLI,CARBON-MONOXIDE,ACID RESISTANCE,SP-NOV,FERMENTATION,ETHANOL,CO2,AUTOETHANOGENUM,CONVERSION},
  language     = {eng},
  number       = {4},
  pages        = {195--204},
  title        = {Impact of formate on the growth and productivity of Clostridium ljungdahlii PETC and Clostridium carboxidivorans P7 grown on syngas},
  url          = {http://dx.doi.org/10.2436/20.1501.01.222},
  volume       = {17},
  year         = {2014},
}

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