Obtaining Fermentable Sugars from a Highly Productive Elm Clone Using Different Pretreatments

David Ibarra, Raquel Martín-Sampedro, Laura Jiménez-López, Juan A. Martín, Manuel J. Díaz and María E. Eugenio
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David Ibarra: Forestry Products Department, Forest Research Center, INIA, Ctra. de La Coruña, Km 7.5, 28040 Madrid, Spain
Raquel Martín-Sampedro: Forestry Products Department, Forest Research Center, INIA, Ctra. de La Coruña, Km 7.5, 28040 Madrid, Spain
Laura Jiménez-López: Forestry Products Department, Forest Research Center, INIA, Ctra. de La Coruña, Km 7.5, 28040 Madrid, Spain
Juan A. Martín: Departamento de Sistemas y Recursos Naturales, ETSI Montes, Forestal y del Medio Natural, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
Manuel J. Díaz: Research Center in Technology of Products and Chemical Processes, Pro2TecS-Chemical Engineering Department, Campus El Carmen, University of Huelva, 21071 Huelva, Spain
María E. Eugenio: Forestry Products Department, Forest Research Center, INIA, Ctra. de La Coruña, Km 7.5, 28040 Madrid, Spain

Energies, 2021, vol. 14, issue 9, 1-21

Abstract: The interest of supplying lignocellulosic materials for producing fermentable sugars has recently emerged in order to diminish the negative environmental effects of fossil fuels. In this study, the Ulmus minor clone Ademuz, characterized for its tolerance to Dutch elm disease and its rapid growth, was evaluated as a source of fermentable sugars. For that, different pretreatments, comprising autohydrolysis, dilute acid hydrolysis, acid catalyzed organosolv, and alkaline extraction, were evaluated at two levels of severity (pretreatment temperatures at 160 °C and 180 °C, except for alkaline extraction at 80 °C and 160 °C); and the resulting pretreated materials were enzymatically hydrolyzed for fermentable sugars production. The major extraction of lignin and hemicellulose was achieved during organosolv (48.9%, lignin; 77.9%, hemicellulose) and acid hydrolysis (39.2%, lignin; 95.0%, hemicellulose) at 180 °C, resulting in the major enzymatic digestibility (67.7%, organosolv; 53.5% acid hydrolysis). Contrarily, under the most favorable conditions for autohydrolysis (180 °C) and alkaline extraction (160 °C), lower extraction of lignin and hemicellulose was produced (4.8%, lignin; 67.2%, hemicellulose, autohydrolysis; 22.6%, lignin; 33.1%, hemicellulose, alkaline extraction), leading to lower enzymatic digestibility (32.1%, autohydrolysis; 39.2%, alkaline extraction). Taking into account the sugars produced during enzymatic hydrolysis of pretreated materials and the solubilized sugars from pretreatment liquors, the highest sugars (glucose and xylose) yield production (28.1%) per gram of biomass from U. minor clone Ademuz was achieved with acid catalyzed organosolv at 180 °C.

Keywords: Ademuz elm clone; biomass production; enzymatic hydrolysis; fermentable sugars; pretreatment (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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