Integrated pretreatment of poplar biomass employing p-toluenesulfonic acid catalyzed liquid hot water and short-time ball milling for complete conversion to xylooligosaccharides, glucose, and native-like lignin

Meysam Madadi, Dan Liu*, Yuanhang Qin, Yinchao Zhang, Keikhosro Karimi, Meisam Tabatabaei, Vijai Kumar Gupta, Mortaza Aghbashlo, I Zahoor, Sameh Samir Ali

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

This work aimed to study an integrated pretreatment technology employing p-toluenesulfonic acid (TsOH)-catalyzed liquid hot water (LHW) and short-time ball milling for the complete conversion of poplar biomass to xylooligosaccharides (XOS), glucose, and native-like lignin. The optimized TsOH-catalyzed LHW pretreatment solubilized 98.5% of hemicellulose at 160 °C for 40 min, releasing 49.8% XOS. Moreover, subsequent ball milling (20 min) maximized the enzymatic hydrolysis of cellulose from 65.8% to 96.5%, owing to the reduced particle sizes and cellulose crystallinity index. The combined pretreatment reduced the crystallinity by 70.9% while enlarging the average pore size and pore volume of the substrate by 29.5% and 52.4%, respectively. The residual lignin after enzymatic hydrolysis was rich in β-O-4 linkages (55.7/100 Ar) with less condensed structures. This lignin exhibited excellent antioxidant activity (RSI of 66.22) and ultraviolet absorbance. Thus, this research suggested a sustainable waste-free biorefinery for the holistic valorization of biomass through two-step biomass fractionation.

Original languageEnglish
Article number129370
JournalBioresource Technology
Volume384
Early online date19 Jun 2023
DOIs
Publication statusPrint publication - Sept 2023

Bibliographical note

Copyright © 2023 Elsevier Ltd. All rights reserved.

Keywords

  • Enzymatic saccharification
  • High-class lignin
  • Integrated pretreatment
  • Lignin antioxidant activity
  • Lignocellulose biomass

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