Acid fraction evolution in wood extractives ofPinus pinaster ait |
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Authors: | Carlos Arrabal Manuel Cortijo |
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Affiliation: | (1) Universidad Politécnica de Madrid, Escuela Técnica Superior de Ingenieros de Montes, Departamento de Ingeniería Forestal, Ciudad Universitaria, 28040 Madrid, Spain |
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Abstract: | The changes in the acid fraction of wood extracts fromPinus pinaster Ait. have been studied. Qualitative and quantitative compositions have been determined in samples that were just extracted
and then seven and twelve months after extraction. Samples were prepared according to Technical Association of Pulp and Paper
Industry Standards, extracted with petroleum ether (b.p. 40–60°C) in a Soxhlet apparatus and saponified with ethanolic 0.4N
potassium hydroxide. The acid fraction was methylated with diazomethane, and its qualitative composition was determined by
combined gas chromatography/mass spectrometry. The quantitative composition was determined by gas chromatography with a DEGS
packed column. An increase was observed in the percentage of palmitic, oleic, pimaric and dehydroabietic acids, and there
was a decrease in the percentage of linoleic and abietic acids. No variation was observed in extract composition after seven
and twelve months. |
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Keywords: | Extractives fatty acids Pinus pinaster Ait resin acids wood |
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