The Role of Extractives in Decay Resistance of Ulin Wood (Eusideroxylon zwageri T. et B.)

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概要

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• The role of extractives from heartwood of Ulin (Eusideroxylon zwageri T. et B.) on durability of wood was investigated. Decay resistance of Ulin heartwood is reduced by extraction with acetone. The addition of acetone extract from Ulin heartwood into woodmeal of Buna (Fagus crenata) showed a significant increase of decay resistance of this wood. From these observations, it can be stated that the Ulin acetone extract may contain fungal toxic substances. Acetone extract from the heartwood of Ulin was then successively fractionated into n-hexane, ethyl ether, and ethyl acetate soluble fractions, and each fraction then subjected to the fungal bioassay. The highest toxicity on mycelial growth of kawaratake (Coriolus versicolor) and ouzuratake (Tyromeces polutris) was found in the n-hexane soluble fraction. Therefore, the chemical components of n-hexane soluble fraction were investigated, and eusiderin, a neolignan, was found as a major compound in n-hexane soluble fraction. Eusiderin showed a toxic activity on mycelial growth of wood-rotting fungi. From these results, eusiderin is considered to be responsible for durability of Ulin wood.Ulin材の耐朽性と抽出成分との関係について調べた。Ulin材をアセトン抽出するとカワラタケ（Coriolus versicolor）およびオオウズラタケ（Tyromeces polutris）に対する耐朽性が低下した。一方，Ulin材アセトン抽出をブナ木粉に添加すると木材腐朽菌に対するブナ木紛の耐朽性は高くなった。このことからアセトン抽出物がUlin材の耐朽性に関与することを示した。そこで，アセトン抽出物中の抗菌活性成について検索した。アセトン抽出物をn-ヘキサン，エチルエーテル，酢酸エチルで逐次抽出し，各画分をMEA培地に添加し，木材腐朽菌の菌糸生長抑制効果について調べた。その結果，n-ヘキサン可溶部を添加したときに，腐朽菌の生長が最も阻害された。n-ヘキサン可溶部をさらにカラムクロマトグラフィーで分画し，Eusiderinを単離した。Eusiderinはn-ヘキサン可溶部の主要成分であった。Ulin材抽出物による腐朽菌生育抑制活性の一因はEusiderinによるものと推定された。

著者

• Syafii Wasrin

  Dept. Of Forest Products Technology Faculty Of Forestry Bogor Agricultural University

• Samejima M

  Department Of Forest Products Faculty Of Agriculture The University Of Tokyo

関連論文

• The Role of Lignin on Decay Resistance of Ulin (Eusideroxylon zwageri T. et B.) to Wood-rotting Fungi
• The Role of Extractives in Decay Resistance of Ulin Wood (Eusideroxylon zwageri T. et B.)
• Isolation of Syringaresinol from Paraserianthes falcataria (L.) Nielsen
• ウリン材の耐朽性におけるリグニンの役割〔英文〕
• ウリン(Eusideroxylon zwageri)心材のネオリグナン類〔英文〕
• The Effect of Lignin Structure on Decay Resistance of Some Tropical Woods
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