title: Supercritical carbon dioxide combined with 1-butyl-3-methylimidazolium acetate and ethanol for the pretreatment and enzymatic hydrolysis of sugarcane bagasse.
abstract: The use of green solvents for the partial delignification of milled sugarcane bagasse (1mm particle size) and for the enhancement of its susceptibility to enzymatic hydrolysis was demonstrated. The experiments were carried out for 2h using 40 g of supercritical carbon dioxide combined with 1-butyl-3-methylimidazolium acetate and 15.8 g of ethanol. The effects of temperature (110-180 °C), pressure (195-250 bar) and IL-to-bagasse mass ratio (0:1-1:1) were investigated through a factorial design in which the response variables were the extent of delignification and both anhydroglucose and anhydroxylose contents in the pretreated materials. The highest delignification degree (41%) led to the best substrate for hydrolysis, giving a 70.7 wt% glucose yield after 12h using 5 wt% and Cellic CTec2® (Novozymes) at 10 mg g(-1) total solids. Hence, excellent substrates for hydrolysis were produced with a minimal IL requirement, which could be recovered by ethanol washing for its downstream processing and reuse.
authors.affiliation: Research Center in Applied Chemistry (CEPESQ), Department of Chemistry, Federal University of Paraná (UFPR), P.O. Box 19032, Curitiba, PR 81531-980, Brazil.
authors.forename: Marcos Henrique Luciano
authors.initials: MH
authors.lastname: Silveira
authors.affiliation: Research Center in Applied Chemistry (CEPESQ), Department of Chemistry, Federal University of Paraná (UFPR), P.O. Box 19032, Curitiba, PR 81531-980, Brazil.
authors.forename: Bruno Angelo
authors.initials: BA
authors.lastname: Vanelli
authors.affiliation: Department of Chemical Engineering, UFPR, Curitiba, PR 82530-990, Brazil.
authors.forename: Marcos Lucio
authors.initials: ML
authors.lastname: Corazza
authors.affiliation: Research Center in Applied Chemistry (CEPESQ), Department of Chemistry, Federal University of Paraná (UFPR), P.O. Box 19032, Curitiba, PR 81531-980, Brazil; INCT in Energy and Environment (INCT E&A), UFPR, Curitiba, PR 81531-980, Brazil.
authors.forename: Luiz Pereira
authors.initials: LP
authors.lastname: Ramos
mesh_terms: D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D002245:Carbon Dioxide / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry; D000431:Ethanol / Q000737:chemistry*; D006868:Hydrolysis; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry; D031786:Saccharum / Q000737:chemistry*; D013696:Temperature
chemical_list: C525963:1-butyl-3-methylimidazolium; D007093:Imidazoles; D052578:Ionic Liquids; D002245:Carbon Dioxide; D000431:Ethanol; D002482:Cellulose; C027433:bagasse
keywords: Enzymatic hydrolysis; Ionic liquid; Pretreatment; Sugarcane bagasse; Supercritical organosolv