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Title

Identifying acetylated lignin units in non-wood fibers using pyrolysis-gas chromatography/mass spectrometry

AuthorsRío Andrade, José Carlos del CSIC ORCID ; Gutiérrez Suárez, Ana CSIC ORCID ; Martínez, Ángel T. CSIC ORCID
KeywordsLignin
Sinapyl acetate
Coniferyl acetate
Kenaf (Hibiscus cannabinus)
Jute (Corchorus capsularis)
Sisal (Agave sisalana)
Abaca (Musa textilis)
Py-GC/MS
Issue Date2004
PublisherJohn Wiley & Sons
CitationRapid Communications in Mass Spectrometry 18:1181-1185 (2004)
AbstractA series of non-wood plant fibers, namely kenaf, jute, sisal and abaca, have been analyzed upon Py-GC/MS of the whole material. The pyrolysis products mainly arise from the carbohydrate and lignin moieties of the fibers. The lignin-derived phenols belonged to the p-hydroxyphenylpropanoid (H), guaiacylpropanoid (G) and syringylpropanoid (S) structures, and showed a high S/G ratio of between 2.0 and 5.4, the highest corresponding to kenaf. Among the lignin-derived phenols released, small amounts of sinapyl and coniferyl acetates (in both cis- and trans- forms) were identified for the first time upon Py-GC/MS of lignocellulosic materials. Acetylation of the sinapyl and coniferyl alcohols was at the γ-position of the side-chain. The release of these alcohols derived from intact acetylated lignin units upon pyrolysis seems to indicate that the native lignin in the fibers selected for this study is at least partially acetylated. Sinapyl (and coniferyl) acetates have recently been suggested to be authentic lignin precursors involved in the polymerization of lignin along with the normal sinapyl and coniferyl alcohols. Py-GC/MS will offer a convenient and rapid tool for analyzing naturally acetylated lignins, as well as to screen plant materials for the presence of acetylated units in lignin.
Description1Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, P.O. Box 1052, E-41080-Seville, Spain 2Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, E-28040-Madrid, Spain E-mail address: delrio@irnase.csic.es
URIhttp://hdl.handle.net/10261/34833
DOI10.1002/rcm.1457
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(CIB) Artículos




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