Journal
BIORESOURCE TECHNOLOGY
Volume 234, Issue -, Pages 343-349Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.02.094
Keywords
Xylooligosaccharide; Fermentable sugar; Corncob; Acetic acid prehydrolysis; Enzymatic hydrolysis
Funding
- National Natural Science Funding of China [31370573]
- Jiangsu Higher Education Institutions
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A novel and green approach for the coproduction of xylooligosaccharides (XOS), in terms of a series of oligosaccharide components from xylobiose to xylohexose, and fermentable sugars was developed using the prehydrolysis of acetic acid that was fully recyclable and environmentally friendly, followed by enzymatic hydrolysis. Compared to hydrochloric acid and sulfuric acid, acetic acid hydrolysis provided the highest XOS yield of 45.91% and the highest enzymatic hydrolysis yield. More than 91% conversion of cellulose was achieved in a batch-hydrolysis using only a cellulase loading of 20 FPU/g cellulose and even a high solid loading of 20% without any special strategies. The acetic acid pretreated corncob should be washed adequately before saccharification to achieve complete hydrolysis. Consequently, a mass balance analysis showed that 139.8 g XOS, 328.1 g glucose, 25.1 g cellobiose, and 147.8 g xylose were produced from 1000 g oven dried raw corncob. (C) 2017 Published by Elsevier Ltd.
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