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Title: Characterization of lignin-derived products from Japanese beech wood as treated by two-step semi-flow hot-compressed water
Authors: Yamauchi, Kazuchika
Phaiboonsilpa, Natthanon
Kawamoto, Haruo  kyouindb  KAKEN_id
Saka, Shiro  kyouindb  KAKEN_id
Author's alias: 坂, 志朗
Keywords: Lignin
Japanese beech
Hot-compressed water
Lignin-derived product
Issue Date: Apr-2013
Publisher: Springer Japan
Journal title: Journal of Wood Science
Volume: 59
Issue: 2
Start page: 149
End page: 154
Abstract: Japanese beech (Fagus crenata) wood was treated by two-step semi-flow hot-compressed water (the first stage: 230 °C/10 MPa/15 min, the second stage: 270 °C/10 MPa/15 min), and produced lignin-derived products in the hot-compressed water-soluble portions at the first and second stages, and the final residue of the second stage was characterized with alkaline nitrobenzene oxidation method and gel permeation chromatographic analysis. As a result, the lignin-derived products at the first stage, where hemicellulose was also decomposed, consisted of lignin-based monomers and dimers and oligomers/polymers in the water-soluble portion. A large part of the oligomers/polymers was, however, recovered as the precipitate during 12 h setting after hot-compressed water treatment. By the analysis of nitrobenzene oxidation products, there were relatively higher contents of ether-type lignin in the precipitate at the first stage than in original beech wood. Since the ether linkages of lignin are more preferentially cleaved by this hot-compressed water, lignin-based polymeric fractions were flowed out from the porous cell walls from which hemicellulose was removed. On the other hand, at the second stage condensed-type lignin remained in the precipitate and residue. Based on these results, decomposition behavior of lignin in Japanese beech wood as treated by the two-step semi-flow hot-compressed water was discussed regarding the topochemistry of lignin structure.
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This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1007/s10086-012-1313-3
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