2021 Fiscal Year Final Research Report
Extended analysis of interunitary linkages of lignin by improved nitrobenzene oxidation
Project/Area Number |
18K05757
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 40020:Wood science-related
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Research Institution | Hokkaido University |
Principal Investigator |
Koda Keiichi 北海道大学, 農学研究院, 准教授 (80322840)
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Project Period (FY) |
2018-04-01 – 2022-03-31
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Keywords | リグニン / ニトロベンゼン酸化 / 不均一系 / 4級アンモニウム塩 |
Outline of Final Research Achievements |
Alkaline nitrobenzene oxidation (NBO), conventionally used for structural analysis of lignin, one of the major components of wood cell wall, was investigated under various reaction conditions. This research project was aimed at an expanded application of the modified NBO method, by stabilization and/or improved yields of the NBO products. Namely, the effect of addition of some reagents were empirically tested: borate for protection of phenolic hydroxy group of NBO products and tetraalkyl ammonium reagents for promoting intersurface reaction of heterogenious NBO. As a results, no improved yields of NBO products were observed by borate addition, while increased yields of some NBO products were observed by tetraalkyl ammonium reagents under a certain reaction condition.
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Free Research Field |
木質科学
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Academic Significance and Societal Importance of the Research Achievements |
木質バイオマスに含まれるリグニンの化学構造分析の手法としては、二次元NMRなどの手法で解析する手法が最近の流行であるが、古典的な湿式化学分解法も、依然、重要な位置を占めている。そうした化学分解法の中で、ニトロベンゼン酸化法はフェノール系のアルデヒドや芳香族酸を比較的高収率で得ることで、試料が由来する高等植物を特徴づける上で、また試料が履歴した化学構造変化を追跡する上で、有用な手法である。本研究では、ニトロベンゼン酸化法が不均一系の反応であることから、反応性の向上などを試みた。一部の条件に限定されるが、反応生成物収率の向上が認められ、適用範囲の拡張に向けた基本知見を見出した。
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