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Energy, Ecology and Environment
Published in: Energy, Ecology and Environment 2/2023

23-01-2023 | Original Article

Microwave irradiation-assisted ionic liquid or deep eutectic solvent pretreatment for effective bioconversion of sugarcane bagasse to bioethanol

Authors: Vishal Sharma, Parushi Nargotra, Surbhi Sharma, Diksha Sawhney, Surbhi Vaid, Ridhika Bangotra, Harish Chander Dutt, Bijender Kumar Bajaj

Published in: Energy, Ecology and Environment | Issue 2/2023

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Abstract

Ionic liquids (ILs), and deep eutectic solvents (DESs), the eco-friendly solubilizing agents for processing of lignocellulosic feedstock, facilitate effective delignification and enhanced carbohydrates accessibility to hydrolytic enzymes for proficient bioconversion. Furthermore, the efficacy of these solvents may be increased by combinative application of microwave irradiation. In the present report, a novel and intensified strategy were developed for sugarcane bagasse (SCB) biomass pretreatment by using combined application of microwave irradiation and IL (1-butyl-3 methylimidazolium chloride, [Bmim]Cl) or DES (choline chloride, ChCl)/glycerol). The in-house enzyme preparation developed from Aspergillus assiutensis VS34 was employed for the saccharification of the pretreated SCB. The maximum sugar was released by combined microwave-[Bmim]Cl + PEG-8000 pretreatment (327.76 ± 1.8 mg/g biomass) followed by microwave + [Bmim]Cl (308.1 ± 2.4 mg/g biomass), and microwave-choline chloride/glycerol (297.36 ± 2.4 mg/g biomass) after 7 min of microwave irradiation. The analysis of combinatorially pretreated biomass by physicochemical techniques such as 1H NMR, FT-IR, XRD, and SEM showed that combined pretreatment induced severe biomass structural deformities, which facilitated the enzymatic hydrolysis and hence, improved the yield of reducing sugars. Fermentation of the sugar hydrolysate yielded an ethanol content of 146.96 ± 1.9 mg/g biomass (bioconversion efficiency, 44.39%). The results of the current study substantiate the effectiveness of microwave-aided combinatorial pretreatment approach with DESs/ILs for an efficient biomass conversion. Comprehensive physicochemical analysis of suitably pretreated SCB biomass may help unraveling the underlying functional processes of combinatorial pretreatment, and for developing biomass specific designer pretreatments for efficient conversion.
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Metadata
Title
Microwave irradiation-assisted ionic liquid or deep eutectic solvent pretreatment for effective bioconversion of sugarcane bagasse to bioethanol
Authors
Vishal Sharma
Parushi Nargotra
Surbhi Sharma
Diksha Sawhney
Surbhi Vaid
Ridhika Bangotra
Harish Chander Dutt
Bijender Kumar Bajaj
Publication date
23-01-2023
Publisher
Springer Berlin Heidelberg
Published in
Energy, Ecology and Environment / Issue 2/2023
Print ISSN: 2363-7692
Electronic ISSN: 2363-8338
DOI
https://doi.org/10.1007/s40974-022-00267-0

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