EXTRACTION AND CHARACTERIZATION OF HEMICELLULOSES FROM Pinus radiata AND ITS FEASIBILITY FOR BIOETHANOL PRODUCTION

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dc.creatorPablo Reyes
dc.creatorRegis Teixeira Mendonça
dc.creatorMaría Graciela Aguayo
dc.creatorJaime Rodríguez
dc.creatorBeatriz Vega
dc.creatorPedro Fardim
dc.date2013
dc.date.accessioned2026-07-07T03:17:17Z
dc.descriptionGalactoglucomannans are the major hemicellulosic fraction present in softwoods, and is mainly composed by the hexoses: galactose, glucose and mannose. The efficient and selective isolation of these hemicelluloses is regarded as one of the most critical obstacles to overcome for their utilization. The objective of the current work was to extract and characterize acidic and neutral aqueous solutions of hemicelluloses from Pinus radiata wood chips and investigate their feasibility for bioethanol production. Hemicelluloses in P. radiata represented 26 g/100 g wood (o.d.w.) and hexoses are responsible for approximately 64% of this amount. According to the different extraction conditions, approximately 50% of the hemicellulosic fraction was solubilized and recovered after precipitation with ethanol. The recovered hemicellulosic fractions were in the form of oligomers with weight-average molecular weigth (Mw) varying from 4x103 to 4x105 g/mol. Hemicellulosic oligomers were hydrolyzed with dilute sulfuric acid and the hydrolysates concentrated until approximately 70 g/L of hexoses and fermented by Saccharomyces cerevisiae yeast. Fermentation results showed that sugar obtained from acid and neutral extractions were fermented to ethanol with maximum yields of 63% and 54% (22 g/ L and 19 g/L), respectively. The conversion of wood hemicellulosic substrates to ethanol is feasible but the low ethanol yields obtained make the process not economically attractive and optimization of the process or alternatives uses for hemicelluloses should be evaluated.
dc.formatapplication/pdf
dc.identifier0100-6762
dc.identifierhttps://www.redalyc.org/articulo.oa?id=48825658017
dc.identifier.urihttp://hdl.handle.net/123456789/429209
dc.languageen
dc.publisherUniversidade Federal de Viçosa
dc.relationhttp://www.redalyc.org/revista.oa?id=488
dc.rightsRevista Árvore
dc.sourceRevista Árvore (Brasil) Num.1 Vol.37
dc.subjectAgrociencias
dc.titleEXTRACTION AND CHARACTERIZATION OF HEMICELLULOSES FROM Pinus radiata AND ITS FEASIBILITY FOR BIOETHANOL PRODUCTION
dc.typeartículo científico

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