Glycerol organosolv pretreatment can unlock lignocellulosic biomass for production of fermentable sugars: Present situation and challenges. (January 2022)

• Record Type: Journal Article
• Authors: Sun, Chihe; Ren, Hongyan; Sun, Fubao; Hu, Yun; Liu, Qiangqiang; Song, Guojie; Abdulkhani, Ali; Loke Show, Pau
• Is Part Of: Bioresource technology. Volume 344:Part B(2022)
• Publication Date: 2022-01
• Subjects: Lignocellulosic biomass -- Organosolv pretreatment -- Enzymatic saccharification -- Structure modification -- Organosolv lignin -- Components recovery; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.126264
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Figure Technical route of GO pretreatment of lignocellulosic biomass. Highlight: Glycerolysis reaction occurs in the GO pretreatment process. Glycerolysis modifies holo-cellulosic structures towards good hydrolyzability. Glycerolysis protects dissolved sugars excessive degradation by trans -glycosylation. Glycerolysis allows glycerol grafting on lignin by etherification and esterification. Industrially relevant saccharification and fermentation deserve unremitting efforts. Abstract: The complex structure of lignocellulosic biomass forms the recalcitrance to prevent the embedded holo-cellulosic sugars from undergoing the biodegradation. Therefore, a pretreatment is often required for an efficient enzymatic lignocellulosic hydrolysis. Recently, glycerol organosolv (GO) pretreatment is revealed potent in selective deconstruction of various lignocellulosic biomass and effective improvement of enzymatic hydrolysis. Evidently, the GO pretreatment is capable to modify the structure of dissolved components by glycerolysis, i.e., by trans -glycosylation onto glyceryl glycosides and by hydroxylation grafting onto glyceryl lignin. Such modifications tend to protect these main components against excessive degradation, which can be mainly responsible for the obviously less fermentation inhibitors arising in the GO pretreatment. This pretreatment can provide opportunities for valorization of emerging lignocellulosic biorefinery with production of value-added biochemicals. Recent advances in GO pretreatment of lignocellulosic biomass followed by enzymatic hydrolysis are reviewed, and perspectives are made for addressing remaining challenges.