Pretreatment of partially delignified hybrid poplar for biofuels production: Characterization of organosolv hemicelluloses |
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Authors: | Xue-Ming ZhangLing-Yan Meng Feng Xu Run-Cang Sun |
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Institution: | a Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing, 100083, China b State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China |
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Abstract: | In this study, extraction of hemicelluloses from the carbohydrate-enriched residues was successfully carried out with organic solvent and the residue was used for bio-based energy production. The chemical composition and physico-chemical properties of six hemicelluloses released were elucidated by a combination of sugar analysis, molecular determination, Fourier transform infrared, and 1H, 13C and 2D-HSQC NMR spectroscopy. The results showed that the successful treatments resulted in a fractionation of the native hemicelluloses. The sugar analysis indicated that xylose (47.14-56.91%) was found to be the major sugar components and small amounts of glucose (14.1-19.06%) and mannose (12.41-18.09%) were also observed in these hemicellulosic fractions. Further studies by NMR spectroscopy exhibited that the acetylated hemicellulosic fraction had a main structure of (1 → 4)-linked β-d-xylopyranosyl backbone with 4-O-methyl-α-d-glucuronic acid as a side chain and a minor structure of linear β-(1 → 4)-linked glucomannans. Furthermore, these hemicelluloses possessed a low substituted degree which was beneficial for enzymatic saccharification. |
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Keywords: | Hemicelluloses Poplar Xylan Biofuels 2D-HSQC NMR |
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