Phenolic Structure of in situ Lignins
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The influence of periodate oxidation on structural changes of Norway spruce lignin was examined, and the distribution of the phenolic hydroxyl groups among the non-condensed guaiacyl and syringyl units for aspen and white birch wood lignins in situ was analyzed by a combination of the nucleus exchange, nitrobenzene oxidation, and periodate oxidation techniques. The results showed that periodate oxidation was relatively specific toward phenolic units and could be used along with the nucleus exchange and nitrobenzene oxidation methods to estimate the proportion of thephenolic and etherified structures of lignin. The percentage of the syringyl units in hardwood ligninshaving a phenolic hydroxyl group was quite small (-5%), being about one-fourth that of the guaiacyl units(20%). This finding fully confirmed a observation that the phenolic hydroxyl group content of wood ligninsdecreased proportionally with an increase in the content of syringyl units.過ヨウ素酸酸化，核交換およびニトロベンゼン酸化を併用する新しいリグニンフェノール核構造の解析法を提案した。本法は単離リグニンのみならずリグノセルロース系複合体中のリグニンに直接適用可能であり，しかも各構成単位におけるフェノール核の分布に関する定量的知見を与える。Norway spruce を用い適正分析条件を検討し，さらに広葉樹(Aspen, Birch)プロトリグニンのフェノール核構造を解析した。過ヨウ素酸飽和溶液，4℃，48時間処理によりリグニンフェノール核は定量的に破壊されること，および広葉樹プロトリグニンのシリンギル単位におけるフェノール核分布率は極めて低く(約5％)，グアイアシル単位の約1/4であることを認めた。
- Faculty of Bioresources, Mie Universityの論文
- 1993-03-26
Faculty of Bioresources, Mie University | 論文
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