title: High-pressure carbon dioxide/water pre-treatment of sugarcane bagasse and elephant grass: Assessment of the effect of biomass composition on process efficiency.
abstract: The performance of two lignocellulosic biomasses was studied in high-pressure carbon dioxide/water pre-treatment. Sugarcane bagasse and elephant grass were used to produce C5-sugars from hemicellulose and, simultaneously, to promote cellulose digestibility for enzymatic saccharification. Different pre-treatment conditions, with combined severity factor ranging from -1.17 to -0.04, were evaluated and maximal total xylan to xylose yields of 59.2wt.% (34.4wt.% xylooligomers) and 46.4wt.% (34.9wt.% xylooligomers) were attained for sugarcane bagasse and elephant grass, respectively. Furthermore, pre-treated biomasses were highly digestible, with glucan to glucose yields of 77.2mol% and 72.4mol% for sugarcane bagasse and elephant grass, respectively. High-pressure carbon dioxide/water pre-treatment provides high total C5-sugars and glucose recovery from both lignocellulosic biomasses; however it is highly influenced by composition and intrinsic features of each biomass. The obtained results confirm this approach as an effective and greener alternative to conventional pre-treatment processes.
authors.affiliation: Unidade de Bioenergia, Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal; Universidade de Caxias do Sul - Instituto de Biotecnologia, Laboratório de Enzimas e Biomassa, 95070-560 Caxias do Sul, RS, Brazil.
authors.forename: Andréia
authors.initials: A
authors.lastname: Toscan
authors.affiliation: Unidade de Bioenergia, Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal; LAQV/REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
authors.forename: Ana Rita C
authors.initials: ARC
authors.lastname: Morais
authors.affiliation: Unidade de Bioenergia, Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal.
authors.forename: Susana M
authors.initials: SM
authors.lastname: Paixão
authors.affiliation: Unidade de Bioenergia, Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal.
authors.forename: Luís
authors.initials: L
authors.lastname: Alves
authors.affiliation: Departamento de Química, Universidade Regional de Blumenau, 89030-903 Blumenau, SC, Brazil.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Andreaus
authors.affiliation: Universidade de Caxias do Sul - Instituto de Biotecnologia, Laboratório de Enzimas e Biomassa, 95070-560 Caxias do Sul, RS, Brazil.
authors.forename: Marli
authors.initials: M
authors.lastname: Camassola
authors.affiliation: Universidade de Caxias do Sul - Instituto de Biotecnologia, Laboratório de Enzimas e Biomassa, 95070-560 Caxias do Sul, RS, Brazil.
authors.forename: Aldo José Pinheiro
authors.initials: AJP
authors.lastname: Dillon
authors.affiliation: Unidade de Bioenergia, Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal. Electronic address: rafal.lukasik@lneg.pt.
authors.forename: Rafal M
authors.initials: RM
authors.lastname: Lukasik
mesh_terms: D056804:Biofuels; D018533:Biomass; D002241:Carbohydrates; D002245:Carbon Dioxide / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D005936:Glucans / Q000737:chemistry; D005947:Glucose / Q000737:chemistry; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry; D031782:Pennisetum / Q000737:chemistry*; D011312:Pressure; D031786:Saccharum / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014994:Xylose / Q000737:chemistry
chemical_list: D056804:Biofuels; D002241:Carbohydrates; D005936:Glucans; D014867:Water; C036909:lignocellulose; D002245:Carbon Dioxide; D002482:Cellulose; D008031:Lignin; C027433:bagasse; D014994:Xylose; D005947:Glucose
keywords: Biomass; Biorefinery; Hydrolysis; Lignocellulose; Supercritical CO(2)