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Composition of non-woody plant lignins and cinnamic acids by Py-GC/MS, Py/TMAH and FT-IR

AuthorsRío Andrade, José Carlos del ; Gutiérrez Suárez, Ana ; Rodríguez García, María Isabel; Ibarra, David ; Martínez, Ángel T.
Non-woody plants
Syringyl/guaiacyl ratio
Tetramethylammonium hydroxide
Ferulic acid
p-Coumaric acid
Issue Date2007
CitationJournal of Analytical and Applied Pyrolysis 79: 39-46 (2007)
AbstractLignins from different non-woody plants such as hemp (Cannabis sativa), flax (Linum usitatissimum), jute (Corchorus capsularis), sisal (Agave sisalana) and abaca (Musa textilis), commonly used for manufacturing specialty papers, were analyzed by pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) in the absence and in the presence of tetramethylammonium hydroxide (TMAH) and by Fourier-transform infrared (FTIR) spectroscopy after alkaline isolation. Hemp and flax lignins showed a predominance of guaiacyl (1-hydroxy-2-methoxyphenyl) units, while jute, sisal and abaca lignins contained predominantly syringyl (1-hydroxy-2,6-dimethoxyphenyl) units. p-Hydroxycinnamic acids, namely p-coumaric and ferulic acids, were also found in the isolated lignins, linked by alkali-resistant ether bonds, especially in abaca and sisal lignins. The presence of the latter compounds in the isolated lignins, as well as in their respective whole fibers, was shown by pyrolysis in the presence of tetramethylammonium hydroxide (Py/TMAH), p-coumaric acid being especially abundant in abaca.
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
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