Selective removal of lignin with sodium chlorite to improve the quality and antioxidant activity of xylo-oligosaccharides from lignocellulosic biomass

Yuehai Wang; Yongqing Yang; Yongshui Qu; Jie Zhang

doi:10.1016/j.biortech.2021.125506

Selective removal of lignin with sodium chlorite to improve the quality and antioxidant activity of xylo-oligosaccharides from lignocellulosic biomass

Bioresour Technol. 2021 Oct:337:125506. doi: 10.1016/j.biortech.2021.125506. Epub 2021 Jul 6.

Authors

Yuehai Wang¹, Yongqing Yang², Yongshui Qu³, Jie Zhang⁴

Affiliations

¹ State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China; State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; School of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
² State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; School of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
³ State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
⁴ State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China. Electronic address: zhangjie@mail.buct.edu.cn.

PMID: 34320775
DOI: 10.1016/j.biortech.2021.125506

Abstract

As a key anti-degradation barrier that restricts the biotransformation of lignocellulose, the presence of lignin usually severely affects the quality of the extracted xylo-oligosaccharides (XOS). Herein, this study proposed a practical route to improve the quality and antioxidant activity of XOS extracted from lignocellulosic biomass via selective removal of lignin. The highest delignification of 92.6% was successfully achieved with 8% sodium chlorite at 75°C for 2 h. An ideal hemicellulose sample with a purity of 86.1% was obtained by selective removal of lignin. A high-quality XOS sample with a purity of 96.3%, a yield of 77.4%, and a color value of 814 was obtained by separating and purifying the enzymatic hydrolysate. Antioxidant activity assay showed that the highest radical scavenging activity of XOS was 87.3%. Importantly, this study provide a feasible and effective route for the lignocellulosic biomass utilization strategy based on the selective removal of lignin.

Keywords: Antioxidant activity; Delignification; Lignocellulosic biomass; Xylo-oligosaccharides (XOS).

MeSH terms

Antioxidants*
Biomass
Chlorides
Hydrolysis
Lignin*
Oligosaccharides

Substances

Antioxidants
Chlorides
Oligosaccharides
lignocellulose
Lignin
chlorite