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Efficacy and functional mechanisms of a novel combinatorial pretreatment approach based on deep eutectic solvent and ultrasonic waves for bioconversion of sugarcane bagasse

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  • Sharma, Vishal
  • Nargotra, Parushi
  • Sharma, Surbhi
  • Bajaj, Bijender Kumar

Abstract

The current study encompasses the development of a combined pretreatment strategy using deep eutectic solvent (DES) i.e. choline chloride (ChCl)/glycerol and ultrasonic waves for the digestibility of sugarcane bagasse (SCB). Pretreated biomass was saccharified by an enzyme cocktail produced in house from a novel fungus Aspergillus assiutensis VS34. Combined ChCl/glycerol and ultrasound pretreatment yielded higher sugars (276.8 mg/g biomass) than either of the individual pretreatments i.e. ChCl/glycerol (235.3 mg/g biomass) or ultrasound (174.5 mg/g biomass). Optimization of pretreatment process variables (biomass loading, sonication amplitude and pretreatment time) by Design of Experiment enhanced sugar yield by 1.12-fold. Sugar hydrolysate obtained was fermented by dual yeast cultures i.e. Saccharomyces cerevisiae and Pichia stipitis to get an ethanol yield of 142.09 mg/g biomass. To understand the molecular mechanism of combined DES/ultrasound pretreatment which led to eased hydrolysis, and enhanced sugar yield, the pretreated biomass was studied by SEM, FT-IR, XRD and 1H NMR analysis for various structural aberrations that made the biomass more amenable to enzymatic hydrolysis. Insights of underlying functional mechanisms of pretreatment may help in developing new/novel designer pretreatment approaches for proficient biomass conversion.

Suggested Citation

  • Sharma, Vishal & Nargotra, Parushi & Sharma, Surbhi & Bajaj, Bijender Kumar, 2021. "Efficacy and functional mechanisms of a novel combinatorial pretreatment approach based on deep eutectic solvent and ultrasonic waves for bioconversion of sugarcane bagasse," Renewable Energy, Elsevier, vol. 163(C), pages 1910-1922.
    • Handle: RePEc:eee:renene:v:163:y:2021:i:c:p:1910-1922
    DOI: 10.1016/j.renene.2020.10.101
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    References listed on IDEAS

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    1. Xie, Wei & Ren, Yanjing & Jiang, Fan & Liang, Jibao & Du, Shuang-kui, 2020. "Pretreatment of quinoa straw with 1-butyl-3-methylimidazolium chloride and physiochemical characterization of biomass," Renewable Energy, Elsevier, vol. 146(C), pages 1364-1371.
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    Cited by:

    1. Zhou, Tianxing & Zhang, Weiwei & Luo, Siyi & Zuo, Zongliang & Ren, Dongdong, 2023. "The effect of ash fusion characteristic on the structure characteristics of carbon and the migration of potassium during rice straw high-temperature gasification process," Energy, Elsevier, vol. 284(C).
    2. Zhang, Qilin & Guo, Zongwei & Zeng, Xianhai & Ramarao, Bandaru & Xu, Feng, 2021. "A sustainable biorefinery strategy: Conversion and fractionation in a facile biphasic system towards integrated lignocellulose valorizations," Renewable Energy, Elsevier, vol. 179(C), pages 351-358.
    3. Li, Fenghai & Zhao, Chaoyue & Fan, Hongli & Xu, Meiling & Guo, Qianqian & Li, Yang & Wu, Lishun & Wang, Tao & Fang, Yitian, 2022. "Ash fusion behaviors of sugarcane bagasse and its modification with sewage sludge addition," Energy, Elsevier, vol. 251(C).

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