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Delignification of Olive Tree Pruning Using a Ternary EutecticSolvent for Enhanced Saccharification and Isolation of a UniqueLignin Fraction

dc.contributor.authorGómez-Cruz , Irene
dc.contributor.authorNalin, Seixas
dc.contributor.authorLabidi, Jalel
dc.contributor.authorCastro, Eulogio
dc.contributor.authorSilvestre, Armando J.D.
dc.contributor.authorda Costa Lopes, André
dc.date.accessioned2025-02-12T12:41:57Z
dc.date.available2025-02-12T12:41:57Z
dc.date.issued2024-09-30
dc.description.abstractThis work aimed at exploring the potentialities of eutectic solvents (ES) in the fractionation of olive tree pruning (OTP) biomass within a biorefinery framework, targeting efficient separation of cellulose fibers and lignin and simultaneously producing high-quality fractions for further processing and application. In this sense, delignification performances of cholinium chloride:ethylene glycol, ChCl:EG (1:9) and cholinium chloride:p-toluenesulfonic acid:ethylene glycol, ChCl:pTSA:EG (1:1:9) as binary and ternary mixtures, respectively, were first evaluated. ChCl:EG demonstrated low efficacy for biomass delignification, while the highest lignin extraction (62.7%) was achieved with ChCl:pTSA:EG at 80 °C and 4 h. At the same conditions, the cellulose content (62.5%) of the resulting solid fraction increased almost three-fold compared to that of the raw OTP (22.3%), using ChCl:pTSA:EG. This ternary ES enabled the OTP matrix breakdown, which, combined with lignin extraction, enhanced the enzymatic hydrolysis of the cellulose-rich fraction to a maximum saccharification yield of 81.8%. The sample exhibited an impressive aliphatic OH group content of 5.2 mmol·g–1 lignin, one of the highest values among the state-of-the-art. The resulting phenomenon is explained by the ethylene glycol grafting onto the lignin structure (aliphatic region), as demonstrated by 31P and HSQC NMR, giving chemical functionality to the isolated lignin fraction. Finally, up to 90% of the initial mass of ChCl:pTSA:EG was recovered through the adsorption of impurities. NMR data validated the high purity and the same molar ratio (1:1:9) of recovered ES, two important outcomes to ensure a sustainable reutilization of this solvent.
dc.description.sponsorshipThe project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MCTES (PIDDAC) The University of Jaén and the Ministry of Universities for the financial support of the Grants for the Recalibration of the Spanish University System for 2021–2023 in the Margarita Salas modality for the training of young doctors. The contract funded by Fundação para a Ciência e Tecnologia (FCT) and project CENTRO-04-3559-FSE-000095 - Centro Portugal Regional Operational Programme (Centro2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF). National NMR Network, funded within the framework of the National Program for Scientific Re-equipment, contract REDE/1517/RMN/2005 with funds from POCI 2010 (FEDER) and FCT.
dc.identifier.citationGÓMEZ-CRUZ, I., Seixas, N., Labidi, J., Castro, E., Silvestre, A.J.D., Lopes Costa, A.M., 2025. Delignification of olive tree pruning using a ternary eutectic solvent for enhanced saccharification and isolation of a unique lignin fraction. ACS Sustain. Chem. Eng. 12, 41, 15012-15023. https://doi.org/10.1021/acssuschemeng.4c03693.
dc.identifier.issn2168-0485
dc.identifier.other10.1021/acssuschemeng.4c03693
dc.identifier.urihttps://doi.org/10.1021/acssuschemeng.4c03693
dc.identifier.urihttps://hdl.handle.net/10953/4690
dc.language.isoeng
dc.publisherACS Publications
dc.relation.ispartofACS Sustainable Chemistry & Engineering [2024]; [12]:[15012-15023]
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.subjectTECHNOLOGY::Chemical engineering::Chemical process and manufacturing engineering::Chemical energy engineering
dc.titleDelignification of Olive Tree Pruning Using a Ternary EutecticSolvent for Enhanced Saccharification and Isolation of a UniqueLignin Fraction
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/publishedVersion

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