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| Content Provider | Springer Nature Link |
|---|---|
| Author | Ehara, Katsubu Saka, Shiro Kawamoto, Haruo |
| Copyright Year | 2002 |
| Abstract | Sugi (Cryptomeria japonica D. Don) and buna (Fugus crenata Blume) woods were treated with supercritical water (>374°C, >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;β-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. |
| Starting Page | 320 |
| Ending Page | 325 |
| Page Count | 6 |
| File Format | |
| ISSN | 14350211 |
| Journal | Journal of Wood Science |
| Volume Number | 48 |
| Issue Number | 4 |
| e-ISSN | 16114663 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2002-01-01 |
| Publisher Place | Tokyo |
| Access Restriction | Subscribed |
| Subject Keyword | Chemical conversion Supercritical water Lignin β-O-4 linkage Condensed-type linkage Wood Science & Technology Materials Science Characterization and Evaluation of Materials |
| Content Type | Text |
| Resource Type | Article |
| Subject | Biomaterials Forestry |
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