RT Journal Article
T1 Assessment of Lignin Residues from Bioethanol Production of Olive Stones as Green Chemical Thickener of Epoxidized Linseed Oil
A1 Cortés Triviño, Esperanza
A1 Valencia Barragán, Concepción
A1 Franco Gómez, José María
A1 Oliva Domínguez, José Miguel
A1 Manzanares, Paloma
A1 Eugenio, María Eugenia
A1 Ibarra, David
AB This work focused on the characterization of lignin residues from bioethanol production of olive stones (OS) and the use of these residues to chemically thicken epoxidized linseed oil (ELO). OS were processed by an acid/steam explosion pretreatment, followed by pre-saccharification, using different enzyme dosages, and simultaneous saccharification and fermentation. The chemical composition of the OS lignin residues was analysed, revealing a high lignin content (66.6–69.5%), and lower quantities of glucan (17.4–19.3%) and xylan (2.8–2.9%). Whereas, the structural properties of OS lignin residues were characterized by Fourier-transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), thermogravimetric analysis and size exclusion chromatography (SEC). OS lignin residues displayed the main inter-unit linkages (β–β′ resinol (51.0–59.0%), followed by β-O-4′ alkyl aryl ethers (27.0–35.2%) and β-5′ phenylcoumaran (11.4–13.2%) substructures), high molecular weights (22,000–25900 Da), low S/G ratios (1.2–1.5) and phenolic groups content (48–55 mg GAE/g lignin). Moreover, OS lignin residues were dispersed in ELO to obtain thickened formulations, which were characterized by FTIR and NMR. Oil thickening was achieved by promoting the chemical crosslinking between lignocellulose hydroxyl groups and ELO epoxy groups, enabling the compatibilization of both components. Up to tenfold viscosity increment of the resulting thickened formulations in relation to ELO’s viscosity was observed. Besides, thickened formulations exhibited viscoelastic properties, evincing oil structuration to some extent.
PB Springer
SN 1572-8919 (electrónico)
YR 2024
FD 2024-04
LK https://hdl.handle.net/10272/23537
UL https://hdl.handle.net/10272/23537
LA eng
NO Cortés-Triviño, E., Valencia, C., Franco, J. M., Oliva, J. M., Manzanares, P., Eugenio, M. E., & Ibarra, D. (2024). Assessment of Lignin Residues from Bioethanol Production of Olive Stones as Green Chemical Thickener of Epoxidized Linseed Oil. In Journal of Polymers and the Environment. Springer Science and Business Media LLC. https://doi.org/10.1007/s10924-024-03216-6
NO Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. This work is collaborative research which is part of different projects: coordinated research projects (RTI2018-096080-B-C21 and RTI2018-096080-B-C22) and project PID2022-141965OB-C21 funded by MCIN/AEI/https://doi.org/10.13039/501100011033 and by “ERDF A way of making Europe”, TED 2021-132122B-C1 funded by MCIN/AEI/https://doi.org/10.13039/501100011033 and by the “European UnionNextGenerationEU/PRTR”, ENE2017-85819-C2-2-R funded by MINECO, and SUSTEC-CM S2018/EMT-4348 project funded by Comunidad de Madrid. The authors gratefully acknowledge the aforementioned financial support.
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026