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Isolation and characterization of hemicelluloses extracted by hydrothermal pretreatment
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
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2012 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 114, 677-683 p.Article in journal (Refereed) Published
Abstract [en]

The dewaxed sample from Triploid of Populus tomentosa Carr. was extracted by using organic alkaline solvent (Dimethylformamide, DMF) via hydrothermal pretreatment. Neutral sugar compositions and molecular weight analysis demonstrated that the hemicellulosic fractions with a higher Uro/Xyl ratio, namely the more branched hemicelluloses, had higher molecular weights. Interestingly, these results were different from the previous report, in which the ratio of Uro/Xyl in the water-soluble hemicellulosic fraction was more than that of the alkali-soluble hemicellulosic fraction. Spectroscopy (FUR, H-1 NMR, C-13 NMR, and HSQC) analysis indicated that the hemicellulosic fractions were mainly composed of (1 -> 4)-linked alpha-D-glucan from starch and (1 -> 4)-linked beta-D-xylan attached with minor amounts of branched sugars from hemicelluloses. In addition, thermal analysis implied that linear hemicelluloses showed more thermal stability than the branched ones during pyrolysis. 

Place, publisher, year, edition, pages
2012. Vol. 114, 677-683 p.
Keyword [en]
Hemicelluloses, Pretreatment, Hydrothermal, Isolation, Organic alkali (DMF)
National Category
Chemical Sciences
URN: urn:nbn:se:uu:diva-178115DOI: 10.1016/j.biortech.2012.03.048ISI: 000305035900096OAI: oai:DiVA.org:uu-178115DiVA: diva2:542011
Available from: 2012-07-27 Created: 2012-07-27 Last updated: 2012-07-27Bibliographically approved

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Zhu, Jie-Fang
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