Co-production of soluble sugars and lignin from short rotation white poplar and black locust crops
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Co-production of soluble sugars and lignin from short rotation white poplar and black locust crops Laura Jiménez-López1 · Raquel Martín-Sampedro1,2 · María E. Eugenio1 José I. Santos3 · Hortensia Sixto4 · Isabel Cañellas4 · David Ibarra1
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Received: 2 April 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Co-production of sugars and lignin from short rotation white poplar and black locust crops is evaluated. Acid-catalyzed ethanol/water organosolv and dilute acid pretreatments are analyzed. Resulting pretreated materials are hydrolyzed enzymatically for sugar production, whereas solubilized lignins from pretreatment liquors are precipitated, analyzed by analytical standard, and characterized by FTIR spectroscopy, SEC chromatography, and solid-state 13 C NMR. Organosolv produces in both materials a high delignification degree (46–50%) and a considerable hemicelluloses removal (62–67%), while acid hydrolysis is more efficient at removing hemicelluloses (86–90%), showing a delignification of 43% (white poplar) and 31% (black locust). Organosolv followed by enzymatic hydrolysis results in 37.8% (white poplar) and 38.2% (black locust) total sugars yields, whereas acid pretreatment and subsequent saccharification show higher sugars yields for white poplar (43.3%) and lower for black locust (29.1%). Regarding lignin samples, higher concentrations are recovered from organosolv liquors of both materials (67.8% and 44.9% yields for white poplar and black locust, respectively) compared to the quantities extracted from acid liquors of white poplar (4.6%) and black locust (6.8%). Organosolv lignins display a lower content of S units and phenols, and higher molecular weights. Contrary, acid lignins consist mainly of phenolic fragments with a higher content of S units and lower molecular weights.
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David Ibarra [email protected]
1
Forestry Products Department, INIA-CIFOR, Ctra de la Coruña Km 7.5, 28040 Madrid, Spain
2
Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Sor Juana Inés de la Cruz 3, Cantoblanco, 28049 Madrid, Spain
3
General Services of Research SGIKER, University of the Basque Country (UPV/EHU), Edificio Joxe Mari Korta Avda. Tolosa 72, 20018 Donostia-San Sebastian, Spain
4
Silviculture and Forest Management Department, INIA-CIFOR, Ctra de la Coruña Km 7.5, 28040 Madrid, Spain
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Wood Science and Technology
Introduction The interest in supplying lignocellulosic materials to biorefineries to produce fuels and products has emerged in recent years to reduce our dependence on fossil fuels and their negative impact on the environment (Arevalo-Gallegos et al. 2017). Lignocellulose is highly abundant and available, cheap, and does not compete with food (Fillat et al. 2017). At the same time, lignocellulosic biomass from dedicated crops is especially interesting from a logistical perspective since it tends to be local, both in time and space, and provides an opportunity for rural development. One of the most effective
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