Arabinosylated phenolics obtained from SO2‐steam‐pretreated sugarcane bagasse |
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| Authors: | Cristhian Carrasco Carlos Solano José Mauricio Peñarrieta Henrique Macedo Baudel Mats Galbe Gunnar Lidén |
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| Affiliation: | 1. Department of Chemical Engineering, Lund University, P.O. Box 124, SE‐221 00, Lund, Sweden;2. Instituto de Investigación y Desarrollo de Procesos Químicos, Ingeniería Química, Facultad de Ingeniería, Universidad Mayor de San Andrés, P.O. Box 12958, La Paz, Bolivia;3. Department of Chemistry, University of Gothenburg, P.O. Box 100, SE‐405 30, Gothenburg, Sweden;4. Instituto de Investigaciones Químicas, Universidad Mayor de San Andrés, Facultad de Ciencias Puras, P.O. Box 303, La Paz, Bolivia;5. Instituto de Investigaciones de Productos Naturales, Universidad Mayor de San Andrés, Facultad de Ciencias Puras, P.O. Box 303, La Paz, Bolivia;6. Department of Chemical Engineering, Universidade Federal de Pernambuco, P.O. Box 50760‐901, Recife, Brazil;7. American Biomass Technologies, P.O. Box 13419‐100, Piracicaba, S?o Paulo, Brazil |
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| Abstract: | A pentose‐rich hydrolysate fraction obtained by extraction of steam‐pretreated sugarcane bagasse was analysed with regard to dissolved phenolics. The liquid obtained after steam pretreatment (2% SO2 (w/w) at 190 °C for 5 min) was divided into two parts: one containing dissolved compounds originating from hemicellulose (with xylose as the dominating compound), and the other containing predominantly dissolved compounds originating from lignin. Using nuclear magnetic resonance, the main dissolved compounds originating from lignin were identified as the glycosylated aromatics, 5‐O‐(trans‐feruloyl)‐L‐Arabinofuranose and 5‐O‐(trans‐coumaroyl)‐L‐Arabinofuranose, together with p‐coumaric acid and small amounts of more common free phenolics such as p‐hydroxybenzaldehyde, p‐hydroxybenzoic acid and vanillin. The phenolic compounds were analysed and quantified using reversed‐phase high‐performance liquid chromatography. The findings show that SO2 steam explosion opened up new degradation pathways during lignin degradation. Copyright © 2012 Society of Chemical Industry |
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| Keywords: | glycosylated aromatics sugarcane bagasse hemicelluloses lignin steam pretreatment SO2 |
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