dc.contributor.author | Eugenio, María E. | |
dc.contributor.author | Martín Sampedro, Raquel | |
dc.contributor.author | Santos González, José Ignacio | |
dc.contributor.author | Wicklein, Bernd | |
dc.contributor.author | Ibarra, David | |
dc.date.accessioned | 2021-07-21T08:29:57Z | |
dc.date.available | 2021-07-21T08:29:57Z | |
dc.date.issued | 2021-06-23 | |
dc.identifier.citation | Molecules 26(13) : (2021) // Article ID 3819 | es_ES |
dc.identifier.issn | 1420-3049 | |
dc.identifier.uri | http://hdl.handle.net/10810/52538 | |
dc.description.abstract | Some agroforestry residues such as orange and olive tree pruning have been extensively evaluated for their valorization due to its high carbohydrates content. However, lignin-enriched residues generated during carbohydrates valorization are normally incinerated to produce energy. In order to find alternative high added-value applications for these lignins, a depth characterization of them is required. In this study, lignins isolated from the black liquors produced during soda/anthraquinone (soda/AQ) pulping of orange and olive tree pruning residues were analyzed by analytical standard methods and Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (solid state 13C NMR and 2D NMR) and size exclusion chromatography (SEC). Thermal analysis (thermogravimetric analysis (TGA), differential scanning calorimetry (DSC)) and antioxidant capacity (Trolox equivalent antioxidant capacity) were also evaluated. Both lignins showed a high OH phenolic content as consequence of a wide breakdown of β-aryl ether linkages. This extensive degradation yielded lignins with low molecular weights and polydispersity values. Moreover, both lignins exhibited an enrichment of syringyl units together with different native as well as soda/AQ lignin derived units. Based on these chemical properties, orange and olive lignins showed relatively high thermal stability and good antioxidant activities. These results make them potential additives to enhance the thermo-oxidation stability of synthetic polymers. | es_ES |
dc.description.sponsorship | This research was funded by Comunidad de Madrid and MCIU/AEI/FEDER, EU via Projects SUSTEC-CM S2018/EMT-4348 and RTI2018-096080-B-C22, respectively. B.W. acknowledges financial support from MINECO (Spain) and FEDER (EU) (project MAT2015-71117-R) and from MICINN (Spain) for a JIN contract (PID2019-107022RJ-I00). | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | MDPI | es_ES |
dc.relation | info:eu-repo/grantAgreement/MCIU/RTI2018-096080-B-C22 | es_ES |
dc.relation | info:eu-repo/grantAgreement/MINECO/MAT2015-71117-R | es_ES |
dc.relation | info:eu-repo/grantAgreement/MCIU/PID2019-107022RJ-I00 | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.subject | lignin purity and composition | es_ES |
dc.subject | lignin structural characterization | es_ES |
dc.subject | lignin thermal properties | es_ES |
dc.subject | lignin antioxidant properties | es_ES |
dc.subject | olive tree pruning | es_ES |
dc.subject | orange tree pruning | es_ES |
dc.subject | soda/AQ pulping | es_ES |
dc.title | Chemical, Thermal and Antioxidant Properties of Lignins Solubilized during Soda/AQ Pulping of Orange and Olive Tree Pruning Residues | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.date.updated | 2021-07-08T14:23:00Z | |
dc.rights.holder | 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). | es_ES |
dc.relation.publisherversion | https://www.mdpi.com/1420-3049/26/13/3819/htm | es_ES |
dc.identifier.doi | 10.3390/molecules26133819 | |