Acid-Assisted Organosolv Pre-Treatment and Enzymatic Hydrolysis of Cynara cardunculus L. for Glucose Production

Mattia Gelosia, Alessandro Bertini, Marco Barbanera, Tommaso Giannoni, Andrea Nicolini, Franco Cotana and Gianluca Cavalaglio
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Mattia Gelosia: CIRIAF (Inter-University Research Center on Pollution and Environment “Mauro Felli”), Biomass Research Centre, University of Perugia, via G. Duranti 63, 06125 Perugia, Italy
Alessandro Bertini: CIRIAF (Inter-University Research Center on Pollution and Environment “Mauro Felli”), Biomass Research Centre, University of Perugia, via G. Duranti 63, 06125 Perugia, Italy
Marco Barbanera: University of Tuscia, Largo dell’Università, s.n.c., Loc. Riello, 01100 Viterbo, Italy
Tommaso Giannoni: CIRIAF (Inter-University Research Center on Pollution and Environment “Mauro Felli”), Biomass Research Centre, University of Perugia, via G. Duranti 63, 06125 Perugia, Italy
Andrea Nicolini: CIRIAF (Inter-University Research Center on Pollution and Environment “Mauro Felli”), Biomass Research Centre, University of Perugia, via G. Duranti 63, 06125 Perugia, Italy
Franco Cotana: CIRIAF (Inter-University Research Center on Pollution and Environment “Mauro Felli”), Biomass Research Centre, University of Perugia, via G. Duranti 63, 06125 Perugia, Italy
Gianluca Cavalaglio: CIRIAF (Inter-University Research Center on Pollution and Environment “Mauro Felli”), Biomass Research Centre, University of Perugia, via G. Duranti 63, 06125 Perugia, Italy

Energies, 2020, vol. 13, issue 16, 1-10

Abstract: Lignocellulosic biomass is a non-edible feedstock that can be used in integrated biorefinery for the production of biochemicals and biofuel. Among lignocellulosic biomass, Cynara cardunculus L. (cardoon) is a promising crop thanks to its low water and fertilizer demand. Organosolv is a chemical treatment that uses numerous organic or aqueous solvent mixtures, and a small amount of acid catalyst, in order to solubilize the lignin and hemicellulose fractions, making the cellulose accessible to hydrolytic enzymes. Lignocellulosic residues of cardoon underwent a two-step treatment process to obtain fermentable glucose. In the first step, the milled biomass was subjected to microwave-assisted extraction using an acidified γ-valerolactone (GVL)/water mixture, yielding a solid cellulose pulp. In the second step, the pre-treated material was hydrolyzed by cellulolytic enzymes to glucose. The first step was optimized by means of a two-level full factorial design. The investigated factors were process temperature, acid catalyst concentration, and GVL/water ratio. A glucose production equal to 30.17 g per 100 g of raw material (89% of the maximum theoretical yield) was achieved after conducting the first step at 150 °C using an acidified water solution (1.96% H 2 SO 4 w / w ).

Keywords: Cynara Cardunculus L.; organosolv pre-treatment; enzymatic hydrolysis; ?-valerolactone (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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