Abstract
Wheat straw was subjected to autohydrolysis treatments in order to selectively hydrolyze the hemicellulose fraction. The effects of temperature (150–240°C) and non-isothermal reaction time on the composition of both liquid and solid phases were evaluated and interpreted using the severity factor (log R 0). The operational conditions leading to the maximum recovery of hemicellulose-derived sugars were established for log R 0 = 3.96 and correspond to 64% of the original (arabino)xylan with 80% of sugars as xylooligosaccharides. Under these conditions, a solubilization of 58% xylan, 83% arabinan, and 98% acetyl groups occurred. Glucan was mainly retained in the solid phase (maximum solubilization 16%), which enables an enrichment of the solid phase to contain up to 61% glucan. Delignification was not extensive, being utmost 15%. The yields of soluble products, including sugars, acetic acid, and degradation compounds, such as, furfural, 5-hydroxymethylfurfural furfural obtained suggest the fitness of liquid stream for fermentation purposes or to obtain xylooligosaccharides with potential applications in food, pharmaceutical, and cosmetic industries.
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Acknowledgements
Authors are grateful to Fundação para a Ciência e a Tecnologia (FCT) for the financial support of this work (project BIOREFINO PTDC/AGR-AAM/71533/2006). Talita Silva-Fernandes gratefully acknowledges the grant funded by CEBio (Prime-IDEIA-AdI Project no. 70/00326).
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Carvalheiro, F., Silva-Fernandes, T., Duarte, L.C. et al. Wheat Straw Autohydrolysis: Process Optimization and Products Characterization. Appl Biochem Biotechnol 153, 84–93 (2009). https://doi.org/10.1007/s12010-008-8448-0
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DOI: https://doi.org/10.1007/s12010-008-8448-0