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Chemical composition of barks from Quercus faginea trees and characterization of their lipophilic and polar extracts

2018Journal article Open access
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dc.contributor.authorFerreira, Joana P.A.
dc.contributor.authorMiranda, Isabel
dc.contributor.authorSousa, Vicelina
dc.contributor.authorPereira, Helena
dc.date.accessioned2018-06-05T09:13:00Z
dc.date.available2018-06-05T09:13:00Z
dc.date.issued2018
dc.description.abstractThe bark from Quercus faginea mature trees from two sites was chemically characterized for the first time. The barks showed the following composition: ash 14.6%, total extractives 13.2%, suberin 2.9% and lignin 28.2%. The polysaccharides were composed mainly of glucose and xylose (50.3% and 35.1% of all monosaccharides respectively) with 4.8% of uronic acids. The suberin composition was: ω-hydroxyacids 46.3% of total compounds, ɑ,ω-alkanoic diacids 22.3%, alkanoic acids 5.9%, alkanols 6.7% and aromatics 6.9% (ferulic acid 4.0%). Polar extracts (ethanol-water) had a high phenolic content of 630.3 mg of gallic acid equivalents (GAE)/g of extract, condensed tannins 220.7 mg of catechin equivalents (CE)/g extract, and flavonoids 207.7 mg CE/g of extract. The antioxidant activity was very high corresponding to 1567 mg Trolox equivalents/g of extract, and an IC50 of 2.63 μg extract/ml. The lipophilic extracts were constituted mainly by glycerol and its derivatives (12.3% of all compounds), alkanoic acids (27.8%), sterols (11.5%) and triterpenes (17.8%). In view of an integrated valorization, Quercus faginea barks are interesting sources of polar compounds including phenols and polyphenols with possible interesting bioactivities, while the sterols and triterpenes contained in the lipophilic extracts are also valuable bioactive compounds or chemical intermediates for specific high-value market niches, such as cosmetics, pharmaceuticals and biomedicinept_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationFerreira JPA, Miranda I, Sousa VB, Pereira H (2018) Chemical composition of barks from Quercus faginea trees and characterization of their lipophilic and polar extracts. PLoS ONE 13(5): e0197135pt_PT
dc.identifier.doi10.1371 /journal.pone.0197135pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.5/15556
dc.language.isoengpt_PT
dc.publisherIng-Feng Chang, National Taiwan Universitypt_PT
dc.relationSFRH /BPD/ 97970/2013pt_PT
dc.subjectQuercus fagineapt_PT
dc.subjectbarkpt_PT
dc.subjectchemical compositionpt_PT
dc.titleChemical composition of barks from Quercus faginea trees and characterization of their lipophilic and polar extractspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FAGR-AAM%2F69077%2F2006/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FAGR%2F00239%2F2013/PT
oaire.citation.titlePLoS ONEpt_PT
oaire.fundingStream3599-PPCDT
oaire.fundingStream5876
person.familyNameSousa
person.givenNameVicelina
person.identifier223146
person.identifier.ciencia-idD71A-897F-89A0
person.identifier.orcid0000-0003-4221-0041
person.identifier.ridB-3067-2016
person.identifier.scopus-author-id14826214800
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
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication.latestForDiscovery4afaffdd-25ee-4d07-af3e-237c2ffe5866
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