Journal
BIORESOURCE TECHNOLOGY
Volume 354, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127190
Keywords
Delignification; Acetic acid hydrolysis; Xylooligosaccharides; Alkaline post-incubation; Monosaccharides
Funding
- National Key Research and Development Program of China [2021YFC2101602]
- National Natural Science Foundation of China, China [32171731]
- Starting Research Fund from Nanjing Forestry University, China [163030103]
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This study investigated the production of xylooligosaccharides (XOS) from lignocelluloses through acetic acid hydrolysis and found that the lignin content has an impact on XOS production. Appropriate delignification can increase XOS yield, and alkaline post-incubation can improve glucose yield.
Organic acid hydrolysis is a potential method for xylooligosaccharides (XOS) production from lignocelluloses. However, the effect of lignin content on XOS production using organic acid hydrolysis remains unclear. In this work, the effect of delignification on XOS production from poplar by acetic acid (AC) hydrolysis was investigated. Hydrogen peroxide-acetic acid (HPAC) pretreatment catalyzed by 0-200 mM H2SO4 (HPAC0-HPAC200) removed 21.6-86.5% of lignin in poplar. HPAC pretreatment increased the xylan accessibility to AC solution, thus increasing the xylan removal during AC hydrolysis. An appropriate delignification (61.7%) resulted in the highest XOS yield of 37.4% by AC hydrolysis, increased by 29.9% compared to the optimal XOS yield (28.8%) from raw poplar. After alkaline post-incubation, the glucose yield of poplar residue rose from 57.1% to 78.6%. This work developed a delignification process to efficiently improve XOS and monosaccharides production from poplar.
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