Composition of non-woody plant lignins and cinnamic acids by Py-GC/MS,Py/TMAH and FT-IR |
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| Affiliation: | 1. UMYMFOR-CONICET and Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, (C1428EGA), Ciudad Autónoma de Buenos Aires, Argentina;2. CONICET, Godoy Cruz 2290 (C1425FQB), Ciudad Autónoma de Buenos Aires, Argentina;3. Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes 748, Butantã, 05508-000, São Paulo (SP), Brazil;4. Ministerio de Culturas y Turismo, Taller de Conservación y Restauración del Patrimonio Mueble, La Paz, Bolivia;5. Centro de Investigación en Arte, Materia y Cultura (IIAC, Universidad Nacional de Tres de Febrero), Avda. Antártida Argentina 1355 (C1104ACA), Ciudad Autónoma de Buenos Aires, Argentina;1. Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, Kunming 650224, China;2. College of Chemical Engineering, Southwest Forestry University, Kunming 650224, China;3. Yunnan Academy of Forestry, Kunming 650224, China;4. Integrated Composites Laboratory (ICL), Department of Chemical and Biomolecular Engineering, University of Tennessee, 322, Dougherty Engineering Bldg., Knoxville, USA;5. Key Laboratory of Materials Processing and Mold, Zhengzhou University, Ministry of Education, Zhengzhou 450002, China;6. National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China;7. School of Urban Planning and Architecture, Southwest Minzu University, Chengdu 610041, China |
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| Abstract: | Lignins 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. |
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