Exploring Natural Fermented Foods as a Source for New Efficient Thermotolerant Yeasts for the Production of Second-Generation Bioethanol

Mouna Aouine, Doha Elalami, Saad Ibnsouda Koraichi, Abdellatif Haggoud and Abdellatif Barakat
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Mouna Aouine: Laboratory of Microbial Biotechnology and Bioactive Molecules, Faculty of Sciences and Techniques, Sidi Mohammed Ben Abdellah University, Fez 30000, Morocco
Doha Elalami: AgroBioSciences Department, Mohammed VI Polytechnic University, Benguérir 43150, Morocco
Saad Ibnsouda Koraichi: Laboratory of Microbial Biotechnology and Bioactive Molecules, Faculty of Sciences and Techniques, Sidi Mohammed Ben Abdellah University, Fez 30000, Morocco
Abdellatif Haggoud: Laboratory of Microbial Biotechnology and Bioactive Molecules, Faculty of Sciences and Techniques, Sidi Mohammed Ben Abdellah University, Fez 30000, Morocco
Abdellatif Barakat: AgroBioSciences Department, Mohammed VI Polytechnic University, Benguérir 43150, Morocco

Energies, 2022, vol. 15, issue 14, 1-11

Abstract: Considering the cost-effectiveness of bioethanol production at high temperatures, there is an enduring need to find new thermotolerant ethanologenic yeasts. In this study, a total of eighteen thermotolerant yeasts were isolated from various natural fermented products in Morocco. Ethanol production using 50 g/L glucose or 50 g/L xylose as the sole carbon source revealed potential yeasts with high productivities and volumetric ethanol productivities at high temperatures. Based on molecular identification, the selected thermotolerant fermentative isolates were affiliated with Pichia kudriavzevii , Kluyveromyces marxianus , and Kluyveromyces sp. During the simultaneous saccharification and fermentation of lignocellulosic biomass at a high temperature (42 °C), the designated yeast P. kudriavzevii YSR7 produced an ethanol concentration of 22.36 g/L, 18.2 g/L and 6.34 g/L from 100 g/L barley straw (BS), chickpea straw (CS), and olive tree pruning (OTP), respectively. It also exhibited multi-stress tolerance, such as ethanol, acetic acid, and osmotic tolerance. Therefore, the yeast P. kudriavzevii YSR7 showed promising attributes for biorefinery-scale ethanol production in the future.

Keywords: lignocellulosic biomass; fermentation; bioethanol; thermotolerant yeasts; stress tolerance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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