Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 111, Issue -, Pages 70-77Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2017.10.014
Keywords
Wheat straw; Hydrothermal pretreatment; Oligosaccharides; Enzymatic hydrolysis
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Funding
- Fundamental Research Funds for the Central Universities [BLX2015-10, 2015ZCQ-CL-02]
- National Natural Science Foundation of China [31430092]
- Program of International S & T Cooperation of China [2015DFG31860]
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Co-production of high value-added oligosaccharides and fermentable sugar from wheat straw is very attractive. In this study, hydrothermal pretreatment combined with alkaline ethanol extraction was developed to pretreat wheat straw for the production of both oligosaccharides and fermentable sugar. The major products in the hydrolysate and the enzymatic digestibility of the remaining residue were evaluated. Results showed that xylooligosaccharides (XOS) and gluco-oligosaccharides (GluOS) were the major products in the hydrolysate, and a maximum XOS yield of 61.69 g/kg wheat straw was achieved as the wheat straw was hydrothermally pretreated at 180 degrees C for 0.5 h. The HSQC results revealed that the degraded product in the hydrolysate was mainly (1 -> 4)-beta-D-xylan attached with a-D-arabinose, 4-O-methyl-D-glucuronic acids, and/or acetyl group. Additionally, the enzymatic hydrolysis rate of the cellulose-rich fractions obtained from the combined treatment process was enhanced 1.5 and 3.5 times, respectively, than that of the hydrothermally pretreated and raw wheat straw.
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