Characterization of lignin in heartwood, sapwood and bark from Tectona grandis using Py–GC–MS/FID

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• 作者：Ana Louren?o ; Duarte Miranda Neiva ; Jorge Gominho…
• 刊名：Wood Science and Technology
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：49
• 期：1
• 页码：159-175
• 全文大小：346 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Wood Science and Technology
  Ceramics,Glass,Composites,Natural Materials
  Operating Procedures and Materials Treatment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-5225

文摘

Sapwood, heartwood and bark of 70-year-old teak trees from an unmanaged stand in East Timor were characterized by pyrolysis (Py–GC–MS/FID). Sapwood and heartwood from teak presented a high lignin content (35.4 and 37.3?% of extractive-free wood) and similar composition. Teak wood is characterized by a GS type of lignin (56.0?% of G-units, 42.2?% of S-units and 1.8?% of H-units in extractive-free wood), with an S/G ratio of 0.8. The major lignin-derived compounds were 4-vinylsyringol (6.6?%), coniferyl alcohol (trans) (4.5?%), coniferaldehyde (2.0?%), 4-vinylguaiacol (1.6?%) and 4-methylguaiacol (1.6?%). Extractive-free teak bark presented 28.0?% of lignin, characterized by a GS type, with 53.3?% G-units, 42.1?% S-units and 4.6?% H-units, with S/G ratio of 0.8. The high lignin content and a composition with predominance of G-units may contribute to the durability and mechanical resistance of teakwood.