Characterization of the hemicellulosic fraction obtained after pre-hydrolysis of Pinus radiata wood chips with hot-water at different initial pH

Pablo Reyes, Regis Teixeira Mendonça, Jaime Rodríguez, Pedro Fardim, Beatriz Vega Erramuspe

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    Hemicelluloses from Pinus radiata wood chips were extracted using different  conditions of temperature, time and initial pH of water (120 to 170°C, 30 to 120min and pH 2 to 12, respectively). Results showed that hemicelluloses represented 26% of wood dry weight and, from this amount, hexoses are responsible for 64%of its composition. The analysis of extraction results showed that pH has a low effect in disassembling hemicelluloses from wood, and that time and temperatureof reaction were the most important parameters. Maximal amount of hemicellulose extracted in the most severe conditions tested was between 12-16% (on woodbasis). In these conditions approximately 40-50% of the hemicellulose in wood was solubilized. As observed by SEC analysis, the recovered hemicellulosicfractions were in the form of low molar mass oligomers with Mw varying from 3720 to 54300 g/mol. The FT-IR spectra show peak multiplicity between 1120and 1000 cm-1 that is a typical characteristic of carbohydrates and only alkaline-extracted hemicelluloses showed the presence of lignin with a characteristic peakat 1509 cm-1.
    Original languageUndefined/Unknown
    Pages (from-to)1614–1618
    JournalJournal of the Chilean Chemical Society
    Issue number1
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed


    • wood hemicelluloses
    • Pinus radiata
    • Galactoglucomannans
    • Biorefinery

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