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Ferulates and lignin structural composition in cork

2016-04Journal article Restricted access
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dc.contributor.authorV Marques, A
dc.contributor.authorRENCORET, JORGE
dc.contributor.authorGutiérrez, Ana
dc.contributor.authorRío, José C. del
dc.contributor.authorPereira, Helena
dc.date.accessioned2016-07-04T10:28:21Z
dc.date.available2016-07-04T10:28:21Z
dc.date.issued2016-04
dc.description.abstractThe structure of lignin and suberin, and ferulic acid (FA) content in cork from Quercus suber L. were studied. Extractive-free cork (Cork), suberin, desuberized cork (Cork(sap)), and milled-cork lignins (MCL) from Cork and Cork(sap) were isolated. Suberin composition was determined by GC-MS/FID, whereas the polymers structure in Cork, Corksap, and MCL was studied by Py-TMAH and 2D-HSQC-NMR. Suberin contained 94.4% of aliphatics and 3.2% of phenolics, with 90% of omega-hydroxyacids and alpha,omega-diacids. FA represented 2.7% of the suberin monomers, overwhelmingly esterified to the cork matrix. Py-TMAH revealed significant FA amounts in all samples, with about 3% and 6% in cork and cork lignins, respectively. Py-TMAH and 2D-HSQC-NMR demonstrated that cork lignin is a G-lignin (>96% G units), with a structure dominated by beta-O-4' alkyl-aryl ether linkages (80% and 77% of all linkages in MCL and MCLsap, respectively), followed by phenylcoumarans (18% and 20% in MCL and MCLsap, respectively), and smaller amounts of resinols (ca. 2%) and dibenzodioxocins (1%). HSQC also revealed that cork lignin is heavily acylated (ca. 50%) exclusively at the side-chain gamma-position. Ferulates possibly have an important function in the chemical assembly of cork cell walls with a cross-linking role between suberin, lignin and carbohydrates.pt_PT
dc.identifier.citationMARQUES, António Jorge Velez; [et. al.] - Ferulates and lignin structural composition in cork. Holzforschung. ISSN 0018-3830. Vol. 70, N.º 4 (2016), pp. 275-286pt_PT
dc.identifier.doi10.1515/hf-2015-0014pt_PT
dc.identifier.issn0018-3830
dc.identifier.issn1437-434X
dc.identifier.urihttp://hdl.handle.net/10400.21/6286
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherWalter de Gruyter GMBHpt_PT
dc.relationIPL 19/2003pt_PT
dc.relationPEstOE/AGR/UI0239/2014pt_PT
dc.relationAGL2011-25379pt_PT
dc.relation.publisherversionhttp://web.a.ebscohost.com/ehost/detail/detail?sid=84fa4301-11d8-4d14-9ea5-7c0bd4cd23c4%40sessionmgr4001&vid=0&hid=4104&bdata=JnNpdGU9ZWhvc3QtbGl2ZSZzY29wZT1zaXRl#AN=114264616&db=a9hpt_PT
dc.subject2D-NMRpt_PT
dc.subjectFerulic acidpt_PT
dc.subjectHSQCpt_PT
dc.subjectPy-TMAHpt_PT
dc.subjectQuercus suberpt_PT
dc.subjectSuberinpt_PT
dc.titleFerulates and lignin structural composition in corkpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage289pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage275pt_PT
oaire.citation.volume70pt_PT
person.familyNameMarques
person.familyNameRENCORET
person.givenNameAntónio
person.givenNameJORGE
person.identifier.orcid0000-0001-7421-6363
person.identifier.orcid0000-0003-2728-7331
person.identifier.ridE-1747-2013
person.identifier.scopus-author-id7202134785
person.identifier.scopus-author-id57194771326
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationb3d0c7ab-dc57-45a9-a86b-6f99a6232f34
relation.isAuthorOfPublication3d6bb576-63bf-4cc3-a65e-7bfa15dce054
relation.isAuthorOfPublication.latestForDiscoveryb3d0c7ab-dc57-45a9-a86b-6f99a6232f34

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