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

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

Renewable Energy, 2020, vol. 153, issue C, 759-765

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.

Keywords: Lignocellulosic biomass; Lactic acid; Bioethanol; Bacillus coagulans; S. cerevisiae; Ethanol tolerance (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:153:y:2020:i:c:p:759-765

DOI: 10.1016/j.renene.2020.02.066

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