Combination of ultrasonication and deep eutectic solvent in pretreatment of lignocellulosic biomass for enhanced enzymatic saccharification

The synergistic effect of ultrasonication with deep eutectic solvent (DES) on pretreatment of oil palm empty fruit bunch (OPEFB) was investigated. Three different types of DESs, namely choline chloride:lactic acid (ChCl:LA), choline chloride:urea (ChCl:U) and choline chloride:glycerol (ChCl:G) were...

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Bibliographic Details
Published in:Cellulose (London) 2021-02, Vol.28 (3), p.1513-1526
Main Authors: Lee, Kiat Moon, Hong, Ju Yin, Tey, Wah Yen
Format: Article
Language:English
Subjects:
Biomass
Bioorganic Chemistry
Ceramics
Chemistry
Chemistry and Materials Science
Chlorides
Choline
Composites
Crystal structure
Crystallinity
Glass
Lactic acid
Lignin
Lignocellulose
Morphology
Natural Materials
Organic Chemistry
Original Research
Physical Chemistry
Polymer Sciences
Pretreatment
Saccharification
Solvents
Sugar
Surface tension
Sustainable Development
Synergistic effect
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Summary:The synergistic effect of ultrasonication with deep eutectic solvent (DES) on pretreatment of oil palm empty fruit bunch (OPEFB) was investigated. Three different types of DESs, namely choline chloride:lactic acid (ChCl:LA), choline chloride:urea (ChCl:U) and choline chloride:glycerol (ChCl:G) were applied. The performance of the pretreatment was evaluated based on yield of reducing sugars, lignin content, crystallinity index, structural and morphology changes. ChCl:LA pretreated OPEFB attained the highest yield of reducing sugars (36.7%) under the action of ultrasonication for 15 min at sonication power 60% (210 W) and temperature 50 °C, followed by ChCl:U (35.8%) and ChCl:G (35.3%). Under these conditions, ChCl:LA pretreated OPEFB showed significant change in structural and morphology, associated with the lowest crystallinity and lignin content. ChCl:LA promoted the pretreatment process in view of its intrinsic properties of low viscosity and low surface tension. The incorporation of ultrasonication in DES pretreatment significantly increased the reducing sugars yield suggested the synergistic effect of ultrasonication with DES pretreatment. These signifies that ultrasound-assisted DES pretreatment could be a promising alternative pretreatment technique for lignocellulosic biomass. Graphic abstract
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-020-03598-5