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Metodologia de extração e determinaçao do teor de extrativos em madeiras de eucalipto Methodology of extration and determination of extractive contents in eucalypt woods

By Flaviano Oliveira Silvério, Luiz Cláudio de Almeida Barbosa, José Lívio Gomide, Fernando Pinheiro Reis and Dorila Piló-Veloso

Abstract

Neste trabalho foi avaliado o teor de extrativos em madeiras de eucalipto, por meio de extrações com acetona, mistura de tolueno:etanol (2:1), clorofórmio e diclorometano. As maiores porcentagens de extrativos totais foram obtidas ao utilizar acetona como solvente. Os extratos obtidos em acetona e tolueno:etanol foram ressuspendidos em diclorometano, para avaliação do teor de extrativos lipofílicos. As porcentagens desses extrativos foram semelhantes às obtidas com diclorometano ou clorofórmio, em extrações diretas. Os extratos foram analisados por espectroscopia no infravermelho, para identificação dos principais grupos funcionais dos constituintes extraídos.<br>The extractives content in eucalypt woods were evaluated using direct extractions with acetone, mixture of toluene:ethanol (2:1), chloroform and dichloromethane. The largest percentages of extractives were obtained using acetone as solvent. The extracts obtained in acetone and toluene:ethanol were dissolved in dichloromethane to establish the percentage of lipophilic extractives. The percentages of these extractives were similar to those obtained with dichloromethane or chloroform by direct extractions. The extracts were analyzed by infrared spectroscopy to identify the main functional groups

Topics: Madeiras de eucalipto, solventes, extrativos e espectroscopia no infravermelho, Eucalypt woods, solvents, extractive and infrared spectroscopy, LCC:Forestry, LCC:SD1-669.5, LCC:Agriculture, LCC:S, DOAJ:Forestry, DOAJ:Agriculture and Food Sciences
Publisher: Sociedade de Investigações Florestais
Year: 2006
DOI identifier: 10.1590/S0100-67622006000600016
OAI identifier: oai:doaj.org/article:596b20b7e79c405cb91a014baa2dc418
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