Journal
BIORESOURCE TECHNOLOGY
Volume 309, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123385
Keywords
Xylooligosaccharides; Fermentable sugars; Sugarcane bagasse; Seawater hydrothermal pretreatment; Enzymatic hydrolysis
Funding
- National Key R&D Program of China [2016YFD0600803]
- National Natural Science Foundation of China [31670579]
- Guangxi Key Laboratory of Chemistry Engineering of Forest Products [GXFC 17-18-07]
- Specific research project of Guangxi for research bases and talents [AD18126005]
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In this study, natural seawater without additional chemicals was selected to treat sugarcane bagasse for the production of xylooligosaccharides and glucose. This pretreatment not only more effectively conserves fresh-water resources than hydrothermal pretreatment and enzymatic hydrolysis, but also decreases corrosion of the equipment relative to techniques utilizing acid and alkaline pretreatment. The maximum yield of 67.12% xylooligosaccharides (of initial xylan), including 11.49% xylobiose, 16.23% xylotriose, 23.82% xylotetraose, and 15.58% xylopentaose was obtained under mild condition (175 degrees C for 30 min). Moreover, greater amounts of xylotetraose were generated during seawater hydrothermal pretreatment under all conditions, likely because NaCl in seawater cut the hydrogen bonds between xylo-oligomers. In addition, 94.69% cellulose digestibility and 78.58% xylan digestibility were achieved from the solid residue with an enzyme dosage of 30 FPU/g cellulose. Results indicated that seawater hydrothermal pretreatment is a more environmentally-friendly and sustainable technique for producing xylooligosaccharides and fermentable sugars than other methods.
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