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The objective of this work was to study the release, identification and characterization of phenolic compounds by saponification of non-isothermal autohydrolysis liquors of corn (Zea mays) cobs andEucalyptus globulus. Corn cobs andE.globulusare lignocellulosic materials with high contents in cellulose and hemicelluloses. Efficient use of these materials can be achieved using autohydrolysis as the first stage of a biorefinery, resulting in a solid phase rich in cellulose and lignin, and a liquid phase containing essentially hemicelluloses-derived compounds and phenolic compounds from the partial solubilization of lignin. This work studied the combination of alkaline hydrolysis and extraction with organic solvents to maximize the amounts of released phenolic compounds since these compounds are interesting for their properties and food applications. [ABSTRACT FROM AUTHOR]

BACKGROUND Ulex europæus ( UE) is a widespread invasive shrub species causing economic problems and environmental hazards. This work deals with the valorization of UE by hydrothermal processing (to obtain hemicelluloses-derived saccharides) followed by simultaneous saccharification and fermentation of the resulting solids for manufacturing second generation bioethanol. RESULTS Hydrothermal processing of UE resulted in the solubilization of up to 21.5 wt% of the oven-dry raw material, leading to the formation of hemicelluloses-derived saccharides as major reaction products. Treatments at various severities resulted in processed solids with enhanced susceptibility to enzymatic hydrolysis, allowing cellulose to glucose conversions up to 87%. Simultaneous saccharification and fermentation of solids pretreated under selected conditions, performed at various charges and solid loadings, resulted in bioethanol conversions up to 82% of the stoichiometric amount, with volumetric concentrations higher than 30 g ethanol L-1. CONCLUSION Hydrothermal processing of UE followed by simultaneous saccharification and fermentation of pretreated solids was suitable for the selective separation of hemicelluloses as soluble saccharides and for the manufacture of second generation bioethanol at high yield from the pretreated solids.© 2012 Society of Chemical Industry [ABSTRACT FROM AUTHOR]