Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/584
Título: Hydrothermal processing of hardwoods and agro-industrial residues :evaluation of xylo-oligosaccharides production
Autor: Carvalheiro, Florbela
Fernandes, Talita Silva
Duarte, Luís C.
Lopes, Sónia
Moura, Patrícia
Pereira, Helena
Gírio, Francisco M.
Data: 2-Set-2009
Citação: Carvalheiro, Florbela; Fernandes, Talita Silva; Duarte, Luís C.; Lopes, Sónia; Moura, Patrícia; Pereira, Helena; Gírio Francisco M. Hydrothermal processing of hardwoods and agro-industrial residues :evaluation of xylo-oligosaccharides production. In: Proceedings of the 2nd Wood Nordic Biorefinery Conference, Helsínquia, Finlândia, 2009,September 2-4, vol. 2, p. 96-102
Resumo: Autohydrolysis was used as a pre-treatment method for the selective hydrolysis of hemicelluloses of four lignocellulosic materials: eucalypt wood chips (EWC), corn cobs (CC), wheat straw (WS) and brewery’s spent grain (BSG), and the process was optimized towards the production of xylo-oligosaccharides (XOS). The effects of temperature, both at isothermal (150-190ºC), and non-isothermal (up to 240ºC) conditions, and liquid-to-solid ratio (LSR), 8 or 10 g/g, on the composition of both the liquid and solid phases were studied. The operational conditions leading to the maximal recovery of XOS for each raw material were established and discussed based on the severity factor (log R0). The higher yields obtained were in the range of 43–65% of the feedstock (arabino)xylan, with the highest value attained for CC for log R0 =3.75. Under the optimised conditions for XOS production, glucan was only slightly solubilised, enabling an enrichment of the solid phase (up to 67% of glucan for EWC). Delignification was also not extensive reaching utmost 18%, in the case of CC. cosmetic industries.
URI: http://hdl.handle.net/10400.9/584
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