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Open Access item Presence of 5-hydroxyguaiacyl units as native lignin constituents in plants as seen by Py-GC/MS

Authors:Río Andrade, José Carlos del
Martínez Ferrer, Ángel Tomás
Gutiérrez Suárez, Ana
Keywords:Lignin, Pyrolysis, 5-Hydroxyguaiacyl, Syringyl, Guaiacyl, Angiosperms, Benzodioxane
Issue Date:2007
Citation:Journal of Analytical and Applied Pyrolysis 79:33-38 (2007)
Abstract:The presence of 5-hydroxyguaiacyl moieties in the lignin from several plants has been assessed by Py-GC/MS. Different woody (eucalypt) and nonwoody (flax, hemp, kenaf, jute, sisal and abaca) angiosperms were selected for this study. The pyrolysis of whole fibers released lignin-derived products with p-hydroxyphenyl, guaiacyl and syringyl structures. Indeed, a series of compounds having a 5-hydroxyguaiacyl nuclei, including 3-methoxycatechol, 5-vinyl-3-methoxycatechol and 5-propenyl-3-methoxycatechol, were detected and identified in all samples, although in lower amounts than the normal guaiacyl and syringyl compounds. The analysis of the lignins isolated from the same plants also indicated the presence of 5-hydroxyguaiacyl moieties in the isolated lignins. These compounds are supposed to arise from the pyrolysis of 5-hydroxyguaiacyl moieties, which are supposed to be native constituents of lignin in plants forming benzodioxane substructures.
Description:Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, P.O. Box 1052, 41080-Seville, Spain 2Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, E-28040 Madrid, Spain E-mail address: delrio@irnase.csic.es (J.C. del Río)
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