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Extractives in some tropical woods

Extraktstoffe verschiedener Tropenhölzer

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Abstract

Total amount and composition of extractives from 12 different tropical wood species were determined by sequential extraction followed by silylation and GC, GC/MS analysis. Hexane and then acetone/water (5:1) mixture was used successively for the extraction. Generally, very low amounts of lipophilics were found (0.05–0.38 mg/g) and the constituent consisted of fatty acids. Hydrophilics were composed of phenolic acids, flavonoids, sterols, stilbenes and a lignan. The highest amount of hydrophilics was found in Afzelia (36.1 mg/g), while the lowest in Wenge and Opepe (0.30 mg/g). Also, cold-hot water, 1% NaOH and some solvent (acetone, dichloromethane) solubilities were determined. The solubility values of tropical woods except for Canalete were found to increase in the order of solvent, cold water, hot water and 1% NaOH.

Zusammenfassung

Die Gesamtmenge und die Zusammensetzung der Extraktstoffe von zwölf verschiedenen Tropenholzarten wurden mittels sequentieller Extraktion und anschließender Silylierung und GC, GC/MS-Analyse bestimmt. Für die Extraktion wurden nacheinander Hexan und eine Aceton/Wasser-Mischung (5:1) verwendet. Generell wurden geringe Mengen an lipophilen Substanzen (0,05–0,38 mg/g) gefunden und die Bestandteile setzten sich aus Fettsäuren zusammen. Die hydrophilen Substanzen setzten sich aus Phenolsäuren, Flavonoiden, Sterinen, Stilbenen und einem Lignan zusammen. Afzelia wies die höchste Menge an hydrophilen Substanzen auf (36,1 mg/g), während in Wenge und Opepe mit 0,30 mg/g die niedrigste Menge gefunden wurde. Daneben wurde auch die Löslichkeit in kaltem und heißem Wasser sowie in 1 % NaOH und einigen Lösemitteln (Aceton, Dichlormethan) bestimmt. Die Löslichkeit der Tropenhölzer nahm außer bei Canalete in der Reihenfolge Lösemittel, kaltes Wasser, warmes Wasser und 1 % NaOH zu.

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Acknowledgements

The authors wish to thank Markku Reunanen, Laboratory of Wood and Paper Chemistry, Åbo Akademi Turku-Finland for performing the Mass Spectras.

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Authors and Affiliations

  1. Faculty of Forestry, Forest Industry Engineering, Bartin University, 74100, Bartin, Turkey

    Ayben Kilic

  2. Institute for Building Materials, Wood Physics, ETH Zurich, Zurich, Switzerland

    Peter Niemz

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  1. Ayben Kilic
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  2. Peter Niemz
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Correspondence to Ayben Kilic.

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Kilic, A., Niemz, P. Extractives in some tropical woods. Eur. J. Wood Prod. 70, 79–83 (2012). https://doi.org/10.1007/s00107-010-0489-8

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  • DOI: https://doi.org/10.1007/s00107-010-0489-8

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