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Buffalo rumen harbours diverse thermotolerant yeasts capable of producing second-generation bioethanol from lignocellulosic biomass

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Listed:
  • Avchar, Rameshwar
  • Lanjekar, Vikram
  • Kshirsagar, Pranav
  • Dhakephalkar, Prashant K.
  • Dagar, Sumit Singh
  • Baghela, Abhishek

Abstract

High-temperature ethanol production from lignocellulosic biomass through simultaneous saccharification and fermentation (SSF) is preferred for the sustainable and cost-effective production of second-generation bioethanol, and SSF requires efficient thermotolerant yeasts. In this study, 101 thermotolerant yeasts were isolated from the buffalo rumen; among selected 48 yeasts, 31 grew at 45 °C, and 17 yeasts could utilise multiple sugars. At 40, 42 and 45 °C, C. glabrata RGB2.2, P. kudriavzevii RGB3.2, K. marxianus RGB4.5, C. tropicalis RGB5.6, and C. nivariensis RGB7.5 strains showed high ethanol concentrations of 4.5–4.9, 4.4–4.8, 3.9–4.2 g/L respectively, with the fermentation efficiency of 78%–95%, 87%–94%, 77%–83%, respectively, in fermentation medium with 1% glucose. Among these yeasts, P. kudriavzevii RGB3.2 and C. glabrata RGB2.2 exhibited significant tolerance towards furfural, 5-HMF, acetic acid, and ethanol. These two strains can produce 9.1 and 9 g/L ethanol, respectively, at 45 °C with a fermentation efficiency of 86.7% and 86%, respectively, through the SSF of alkali-treated rice straw. Therefore, the buffalo rumen can be a potential niche for inhibitor tolerant, multiple sugar-utilising, ethanologenic, thermotolerant yeasts suitable for SSF approach.

Suggested Citation

  • Avchar, Rameshwar & Lanjekar, Vikram & Kshirsagar, Pranav & Dhakephalkar, Prashant K. & Dagar, Sumit Singh & Baghela, Abhishek, 2021. "Buffalo rumen harbours diverse thermotolerant yeasts capable of producing second-generation bioethanol from lignocellulosic biomass," Renewable Energy, Elsevier, vol. 173(C), pages 795-807.
  • Handle: RePEc:eee:renene:v:173:y:2021:i:c:p:795-807
    DOI: 10.1016/j.renene.2021.04.002
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    1. Láinez, Magdiel & Ruiz, Héctor A. & Arellano-Plaza, Melchor & Martínez-Hernández, Sergio, 2019. "Bioethanol production from enzymatic hydrolysates of Agave salmiana leaves comparing S. cerevisiae and K. marxianus," Renewable Energy, Elsevier, vol. 138(C), pages 1127-1133.
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