Microwave-assisted extraction of high-molecular-weight hemicelluloses from spruce wood

Publication date: Available online 12 August 2019Source: Comptes Rendus ChimieAuthor(s): Morad Chadni, Olivier Bals, Isabelle Ziegler-Devin, Nicolas Brosse, Nabil GrimiAbstractMicrowave-assisted extraction (MAE) at atmospheric pressure has been demonstrated as an efficient technology for the extraction of polymeric hemicelluloses from spruce sawdust. This technology was shown to be more efficient than conventional extraction. MAE leads to a high solubilization of wood and a selective extraction of hemicellulose polymers with high molecular weights. To optimize MAE, different treatment powers (125–573 W) of presoaked spruce sawdust in water and 1 M sodium hydroxide solution for a period of 60 min were tested. The yield of hemicellulose extraction increased with the microwave power in both mediums, but with a clear advantage for presoaked samples in basic medium. The characterization of extracted hemicelluloses has shown high extraction selectivity depending on the medium of impregnation of sawdust before MAE: High-molecular-mass acetylated galactoglucomannans (Mw ∼ 41 kDa) were isolated after presoaking in water and higher molecular mass arabinoglucoronoxylans (Mw ∼ 66 kDa) in basic medium.RésuméLe traitement par microondes (MAE) à pression atmosphérique a montré son efficacité pour l'extraction des polymères d'hémicelluloses à partir de sciure de bois d’épicéa. Cette technologie de traitement s'est avérée plus efficace qu'un traitement thermique conv...
Source: Comptes Rendus Chimie - Category: Chemistry Source Type: research