2002年
Characterization of the lignin-derived products from wood as treated in supercritical water
JOURNAL OF WOOD SCIENCE
- ,
- ,
- 巻
- 48
- 号
- 4
- 開始ページ
- 320
- 終了ページ
- 325
- 記述言語
- 英語
- 掲載種別
- 研究発表ペーパー・要旨(国際会議)
- DOI
- 10.1007/BF00831354
- 出版者・発行元
- SPRINGER-VERLAG TOKYO
Sugi (Cryptomeria japonica D. Don) and buna (Fugus crenata Blume) woods were treated with supercritical water (> 374degreesC, > 22.1 MPa) and fractionated into a water-soluble portion and a water-insoluble residue. The latter was washed with methanol to be fractionated further into a methanol-soluble portion and a methanol-insoluble residue. Whereas the carbohydrate-derived products were in the water-soluble portion, most of the lignin-derived products were found in the methanol-soluble portion and methanol-insoluble residue. The lignin-derived products in the methanol-soluble portion were shown to have more phenolic hydroxyl groups than lignin in original wood. The alkaline nitrobenzene oxidation analyses, however, exhibited much less oxidation product in the methanol-soluble portion and methanol-insoluble residue. These lines of evidence suggest that the ether linkages of lignin are preferentially cleaved during supercritical water treatment. To simulate the reaction of lignin, a study with lignin model compounds was performed; beta-O-4-type lignin model compounds were found to be cleaved, whereas biphenyl-type compounds were highly stable during supercritical water treatment. These results clearly indicated that the lignin-derived products, mainly consisting of condensed-type linkages of lignin due to the preferential degradation of the ether linkages of lignin, occurred during supercritical water treatment.
- リンク情報
- ID情報
-
- DOI : 10.1007/BF00831354
- ISSN : 1435-0211
- Web of Science ID : WOS:000178830300011