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Advances and challenges in deep eutectic solvents pretreatment technologies for bioethanol production from lignocellulosic biomass: A comprehensive review

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  • Novia, Novia
  • Jannah, Asyeni Miftahul
  • Melwita, Elda
  • Fudholi, Ahmad
  • Pareek, Vishnu K.

Abstract

The increasing demand for sustainable, renewable energy sources is the primary driver of bioethanol production from lignocellulosic biomass (LCB). In this context, Deep Eutectic Solvents (DES) have emerged as a novel, eco-friendly alternative, offering low toxicity, biodegradability, adjustable properties, and a significant lignin solubilization capability compared to traditional pretreatment methods. Therefore, this article thoroughly reviews recent developments in DES pretreatment technologies, including design and formulation, biomass fractionation mechanisms, and impacts on enzymatic hydrolysis, including fermentation efficiency. Several choline chloride-based and natural DES types have considerably enhanced cellulose accessibility and bioethanol production. However, significant challenges persist, such as the need for economical DES synthesis, effective solvent recovery, and scalable processes for industrial applications. The interaction of these solvents with enzymes and microbial systems necessitates further investigation to optimize integrated bioprocesses. Overcoming these challenges through innovative research and process optimization would facilitate the widespread implementation of DES pretreatment. As a result, this enhanced bioethanol production's sustainability, efficiency, and economic viability.

Suggested Citation

  • Novia, Novia & Jannah, Asyeni Miftahul & Melwita, Elda & Fudholi, Ahmad & Pareek, Vishnu K., 2026. "Advances and challenges in deep eutectic solvents pretreatment technologies for bioethanol production from lignocellulosic biomass: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 231(C).
    • Handle: RePEc:eee:rensus:v:231:y:2026:i:c:s1364032126000511
    DOI: 10.1016/j.rser.2026.116752
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