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Successive and quantitative fractionation and extensive structural characterization of lignin from wheat straw
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. Vienna University of Technology, Austria.
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2014 (English)In: Industrial crops and products (Print), ISSN 0926-6690, Vol. 61, 249-257 p.Article in journal (Refereed) Published
Abstract [en]

A unique process for the fractionation of lignin from wheat straw is proposed: Ball milling for 8 h, followed by a direct and an acidolysis-assisted dioxane-water extraction. Four distinctly different lignin structures were thus obtained: (1) one free non-core lignin, which is a cellulose-lignin with lowest molar mass and highest contents of p-hydroxycinnamic acids, condensed phenolic hydroxyl groups and tricin moieties, and with a detectable amount of cinnamyl alcohols; (2) two core xylan-lignins differing in their degree of branching as indicated by their xylose/arabinose ratios of >4 and similar to 2, respectively; (3) one core cellulose-lignin which is the residual fraction resistant to all extractions. Based on the mass balance of Klason lignin the yields of these four fractions are 13.8%, 18.1%, 37.5% and 12.5%, respectively, thus accounting for 82% of the total KL in wheat straw. Therefore, the isolated lignin fractions could be considered as highly representative allowing a good insight into the different features of wheat straw lignin.

Place, publisher, year, edition, pages
2014. Vol. 61, 249-257 p.
Keyword [en]
Lignin, Fractionation, Wheat straw, 2D HSQC NMR, Ball-milling
National Category
Agricultural Science
URN: urn:nbn:se:kth:diva-155776DOI: 10.1016/j.indcrop.2014.07.013ISI: 000343339200031ScopusID: 2-s2.0-84904874804OAI: diva2:763117

QC 20141113

Available from: 2014-11-13 Created: 2014-11-13 Last updated: 2014-11-13Bibliographically approved

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Zikeli, FlorianLi, Jiebing
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