RT info:eu-repo/semantics/conferenceObject
T1 Natural deep eutectic solvents as green pretreatment agents in the biocascade processing of onion peel waste
A1 Benito Román, Oscar
A1 Candela Gil, Helena
A1 Barea Gómez, Pedro
A1 Illera Gigante, Alba Ester
A1 Melgosa Gómez, Rodrigo
A1 Beltrán Calvo, Sagrario
A1 Sanz Díez, Mª Teresa
K1 Onion peel waste
K1 NADES
K1 Bio-cascade
K1 Nanocellulose
AB In alignment with circular economy principles and the sustainable valorisation of biomass, thiswork addresses an intermediate stage in a novel green biocascade strategy aimed at convertingonion peel waste, an abundant agro-industrial by-product, into cellulose nanofibers. At this stage,the process focuses on the selective removal of non-cellulosic structural components to enrich thecellulose fraction within the lignocellulosic matrix. To achieve this objective, Natural DeepEutectic Solvents (NADES) were employed as environmentally benign alternatives toconventional toxic solvents for the pretreatment step. A systematic screening was conducted toevaluate various combinations of hydrogen bond acceptors (HBAs), such as choline chloride andbetaine, with different hydrogen bond donors (HBDs), primarily organic acids. Key operationalparameters, including temperature, NADES-to-onion peel ratio, HBA:HBD molar ratio, andreaction time (up to 10 hours), were thoroughly investigated. Among the tested formulations,choline chloride:lactic acid (ratio 1:2) and choline chloride:tartaric acid (ratio 1:2) mixturesdemonstrated the most promising performance, operating effectively at temperatures between 100and 120 ºC. Under these conditions, and after 6 hours of processing time, an increase in cellulosecontent exceeding 50% was achieved in the treated biomass, with cellulose and lignin identifiedas the main remaining constituents in the solid fraction. This approach represents a sustainable andefficient pathway for the valorisation of agri-food residues through green chemistry, supportingthe advancement of integrated biorefineries and fostering the transition towards circularbioeconomy models.
YR 2025
FD 2025
LK https://hdl.handle.net/10259/12220
UL https://hdl.handle.net/10259/12220
LA eng
NO Trabajo presentado en: XVI International Scientific Agriculture Symposium "Agrosym 2025", Jahorina, Bosnia and Herzegovina, October 2-5, 2025
NO This work is supported by the Spanish Research Agency (AEI) [grant number PID2022- 136385OB-I00], Junta de Castilla y León (JCyL), and European Regional Development Fund (ERDF) [grant number BU027P23]. Ó. Benito-Román contract is funded by Ministerio de Ciencia, Innovación y Universidades through grant RYC2023-043578-I. A.E. Illera postdoctoral contract is funded by BU027P23. H Candela pre-doctoral contract is funded by JCyL and the European Social Fund [ORDEN EDU/1009/2024]. P. Barea pre-doctoral contract is funded by JCyL and the European Social Fund (ESF) [ORDEN EDU/1868/2022].
DS Repositorio Institucional de la Universidad de Burgos
RD 03-oct-2026