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Publication
Microwave-assisted hydrothermal processing of pine nut shells for oligosaccharide production
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Advisor(s)
Abstract(s)
ABSTRACT: Pine nut shells, a biomass residue from the Mediterranean Pinus pinea pine nut industrial processing, were treated by microwave-assisted autohydrolysis to produce xylo-oligosaccharides. Microwave-assisted processes provide alternative heating that may reduce energy input and increase overall process efficiency. The autohydrolysis treatments were performed under isothermal and non-isothermal operations within a wide range of operational conditions (temperature/reaction times) covering several severity regimes (as measured by the log R-0 severity factor). The composition of the autohydrolysis liquors was determined in terms of oligo- and monosaccharides, aliphatic acids and degradation compounds. The process was highly selective towards hemicelluloses hydrolysis and liquid streams containing a mixture of oligomeric compounds (mainly xylo-oligosaccharides) could be obtained under relatively mild operation conditions (190 degrees C, 30 min) with a maximal oligosaccharides' concentration of 18.48 g/L. The average polymerization degree of the obtained oligosaccharides was characterised by HPLC, showing that for the optimal conditions a mixture of oligomers with DPs from 2 to 6.
Description
Keywords
Biorefinery Hemicellulose Fractionation Microwave heating
Citation
Torrado, I., Neves, B.G., Fernandes, M.C., Carvalheiro, F., Pereira, H. & Duarte, L.C. (2024) Microwave-assisted hydrothermal processing of pine nut shells for oligosaccharide production. In: Biomass Conversion and Biorefinery, 2024. https://doi.org/10.1007/s13399-023-05244-z
Publisher
Springer