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Towards sequential bioethanol and l-lactic acid co-generation: Improving xylose conversion to l-lactic acid in presence of lignocellulosic ethanol with an evolved Bacillus coagulans

Author

Listed:
  • Cubas-Cano, Enrique
  • López-Gómez, José Pablo
  • González-Fernández, Cristina
  • Ballesteros, Ignacio
  • Tomás-Pejó, Elia

Abstract

A wide range of biofuels and bio-based products can be produced from lignocellulose considering its high compositional diversity. Ethanol production by yeasts from cellulosic glucose is well-known, while hemicellulosic xylose utilization is still challenging. This work proposes the use the xylose for l-lactic acid fermentation. In this context, a sequential cultivation of Saccharomyces cerevisiae and the C5-utilizing Bacillus coagulans is studied. High ethanol yields, around 0.44 g g−1, were obtained from a cellulosic-gardening hydrolysate. The high ethanol concentrations did not affect the evolved B. coagulans A20-EXA obtained by adaptive evolution to ethanol. As a result, 2.6-fold increase in lactic acid yield was achieved when compared with parental B. coagulans strain in presence of 5% (v v−1) ethanol. These results demonstrated the suitability of B. coagulans A20-EXA to be used together with S. cerevisiae for the sequential co-generation of ethanol and lactic acid from lignocellulosic biomass in a biorefinery approach.

Suggested Citation

  • Cubas-Cano, Enrique & López-Gómez, José Pablo & González-Fernández, Cristina & Ballesteros, Ignacio & Tomás-Pejó, Elia, 2020. "Towards sequential bioethanol and l-lactic acid co-generation: Improving xylose conversion to l-lactic acid in presence of lignocellulosic ethanol with an evolved Bacillus coagulans," Renewable Energy, Elsevier, vol. 153(C), pages 759-765.
    • Handle: RePEc:eee:renene:v:153:y:2020:i:c:p:759-765
    DOI: 10.1016/j.renene.2020.02.066
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    Cited by:

    1. Du, Ran & Li, Chong & Lin, Weichao & Lin, Carol Sze Ki & Yan, Jianbin, 2022. "Domesticating a bacterial consortium for efficient lignocellulosic biomass conversion," Renewable Energy, Elsevier, vol. 189(C), pages 359-368.
    2. Maria José Negro & Cristina Álvarez & Pablo Doménech & Raquel Iglesias & Ignacio Ballesteros, 2020. "Sugars Production from Municipal Forestry and Greening Wastes Pretreated by an Integrated Steam Explosion-Based Process," Energies, MDPI, vol. 13(17), pages 1-14, August.

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