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Structural characterization of lignin from Grape Stalks (Vitis vinifera L.)

2014Journal article Open access
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dc.contributor.authorProzil, Sónia
dc.contributor.authorEvtuguin, Dmitry V.
dc.contributor.authorSilva, Artur M. S.
dc.contributor.authorCruz-Lopes, Luísa
dc.date.accessioned2023-01-12T16:38:55Z
dc.date.available2023-01-12T16:38:55Z
dc.date.issued2014
dc.date.updated2023-01-12T12:17:58Z
dc.description.abstractThe chemical structure of lignin from grape stalks, an abundant waste of winemaking, has been studied. The dioxane lignin was isolated from extractive- and protein-free grape stalks (Vitis vinifera L.) by modified acidolytic procedure and submitted to a structural analysis by wet chemistry (nitrobenzene and permanganate oxidation (PO)) and spectroscopic techniques. The results obtained suggest that grape stalk lignin is an HGS type with molar proportions of p-hydroxyphenyl (H), guaiacyl (G) and syringyl (S) units of 3:71:26. Structural analysis by 1H and 13C NMR spectroscopy and PO indicates the predominance of β-O-4′ structures (39% mol) in grape stalk lignin together with moderate amounts of β-5′, β-β, β-1′, 5-5′, and 4-O-5′ structures. NMR studies also revealed that grape lignin should be structurally associated with tannins. The condensation degree of grape stalks lignin is higher than that of conventional wood lignins and lignins from other agricultural residues.pt_PT
dc.description.versionN/Apt_PT
dc.identifier.doi10.1021/jf502267spt_PT
dc.identifier.eid2-s2.0-84902682673
dc.identifier.slugcv-prod-1504277
dc.identifier.urihttp://hdl.handle.net/10400.19/7529
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.subjectgrape stalkspt_PT
dc.subjectdioxane ligninpt_PT
dc.subjectnitrobenzene oxidationpt_PT
dc.subjectpermanganate oxidationpt_PT
dc.subject1H NMRpt_PT
dc.subject13C NMRpt_PT
dc.subjectHSQCpt_PT
dc.subjectFTIRpt_PT
dc.subjectUV−vispt_PT
dc.titleStructural characterization of lignin from Grape Stalks (Vitis vinifera L.)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage5428pt_PT
oaire.citation.issue24pt_PT
oaire.citation.startPage5420pt_PT
oaire.citation.titleJournal of Agricultural and Food Chemistrypt_PT
oaire.citation.volume62pt_PT
person.familyNameGonçalves Oliveira Valente da Cruz-Lopes
person.givenNameLuísa Paula
person.identifier.ciencia-id7916-0833-5B38
person.identifier.orcid0000-0001-6502-7202
rcaap.cv.cienciaid7916-0833-5B38 | Luísa Paula Gonçalves Oliveira Valente da Cruz-Lopes
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationfa1274f5-f7f8-4afd-8ed8-5f988d6c7226
relation.isAuthorOfPublication.latestForDiscoveryfa1274f5-f7f8-4afd-8ed8-5f988d6c7226

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