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Hardwood and softwood lignins from sulfite liquors: structural characterization and valorization through depolymerization

2022Journal article Open access
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dc.contributor.authorCasimiro, Filipa M.
dc.contributor.authorCosta, Carina A.E.
dc.contributor.authorVega-Aguilar, Carlos
dc.contributor.authorRodrigues, Alírio
dc.date.accessioned2023-01-16T15:26:43Z
dc.date.available2023-01-16T15:26:43Z
dc.date.issued2022
dc.description.abstractThis work aims to evaluate the structural characteristics and study the oxidative depolymerization of lignins obtained from hardwood and softwood sulfite liquors. Lignins were obtained after ultrafiltration and freeze- drying of the sulfite liquors and characterized based on inorganic content, nitrobenzene oxidation, 13C NMR, and molecular weight determination. The structural characteristics achieved allow evaluating the potential of each lignin through oxidative depolymerization to produce added-value phenolic monomers. Hardwood and softwood lignins were submitted to alkaline oxidation with oxygen and the reaction conditions optimized to obtain a final oxidation mixture with the maximum yield of phenolic monomers. Through oxidation with O2, hardwood lignin generates mostly syringaldehyde while lignin from softwood biomass mainly produces vanillin; moreover, a lower reaction time and the interruption of O2 admission avoid the degradation of the oxidation products in the final mixture for both lignins, more evidenced to hardwood lignin due to its higher reactivity. From the results, it is possible to conclude that a phenolic aldehyde-rich oxidation mixture could be obtained, confirming the viability of lignin as raw material to produce added-value products as vanillin and syringaldehyde.pt_PT
dc.description.sponsorshipThis work was financially supported by LA/P/0045/2020 (ALiCE), UIDB/50020/2020 and UIDP/50020/2020 (LSRE-LCM), funded by national funds through FCT/MCTES (PIDDAC); Base Funding - UIDB/00690/2020 of CIMO - Centro de Investigação de Montanha - funded by national funds through FCT/MCTES (PIDDAC); COST Action LignoCOST (CA17128). Carlos Vega-Aguilar thanks the Costa Rican Science, Technology and Telecommunications Ministry for the PhD. Scholarship MICITT-PINN-CON-2-1-4-17-1-002. Authors are grateful to Company A and Caima - Indústria de Celulose, S.A. (Portugal) for the supply of the samples of sulfite liquorpt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCasimiro, Filipa M.; Costa, Carina A.E.; Vega-Aguilar, Carlos; Rodrigues, Alírio (2022). Hardwood and softwood lignins from sulfite liquors: Structural characterization and valorization through depolymerization. International Journal of Biological Macromolecules. EISSN 0141-8130. 215, p. 272-279pt_PT
dc.identifier.doi10.1016/j.ijbiomac.2022.06.067pt_PT
dc.identifier.eissn1879-0003
dc.identifier.issn0141-8130
dc.identifier.urihttp://hdl.handle.net/10198/26525
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationLA/P/0045/2020pt_PT
dc.relationLaboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials
dc.relationLaboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials
dc.relationMountain Research Center
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectSulfite liquorpt_PT
dc.subjectLigninpt_PT
dc.subjectStructural characterizationpt_PT
dc.subjectOxidative depolymerizationpt_PT
dc.subjectPhenolic monomerspt_PT
dc.titleHardwood and softwood lignins from sulfite liquors: structural characterization and valorization through depolymerizationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleLaboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials
oaire.awardTitleLaboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials
oaire.awardTitleMountain Research Center
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50020%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50020%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00690%2F2020/PT
oaire.citation.endPage279pt_PT
oaire.citation.startPage272pt_PT
oaire.citation.titleInternational Journal of Biological Macromoleculespt_PT
oaire.citation.volume215pt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
person.familyNameVega-Aguilar
person.givenNameCarlos
person.identifier.ciencia-idB317-9A71-11CC
person.identifier.orcid0000-0001-8542-8732
person.identifier.scopus-author-id57216671117
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication.latestForDiscoveryad6066dd-2d60-4b44-b14a-5d3ba134b963
relation.isProjectOfPublication79ed495f-40dc-45d0-b98c-7e777db59e9b
relation.isProjectOfPublication75d8d4f7-ae07-4777-a9f1-3e833d96d5b4
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