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Walnut (Juglans regia L.) leaves: phenolic compounds, antimicrobial activity ans antioxidant potential of different cultivars

2007Journal article Open access
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dc.contributor.authorPereira, J.A.
dc.contributor.authorOliveira, Ivo
dc.contributor.authorSousa, Anabela
dc.contributor.authorValentão, Patrícia
dc.contributor.authorAndrade, Paula B.
dc.contributor.authorFerreira, Isabel C.F.R.
dc.contributor.authorFerreres, Frederico
dc.contributor.authorBento, Albino
dc.contributor.authorSeabra, Rosa M.
dc.contributor.authorEstevinho, Leticia M.
dc.date.accessioned2008-09-03T08:46:12Z
dc.date.available2008-09-03T08:46:12Z
dc.date.issued2007
dc.description.abstractDifferent cultivars of walnut (Juglans regia L.) leaves (Cv. Lara, Franquette, Mayette, Marbot, Mellanaise and Parisienne) grown in Portugal, were investigated in what concerns phenolic compounds and antimicrobial and antioxidant properties. Phenolics analysis was performed by reversed-phase HPLC/DAD and 10 compounds were identified and quantified: 3- and 5-caffeoylquinic acids, 3- and 4-pcoumaroylquinic acids, p-coumaric acid, quercetin 3-galactoside, quercetin 3-pentoside derivative, quercetin 3-arabinoside, quercetin 3-xyloside and quercetin 3-rhamnoside. The antimicrobial capacity was screened against Gram positive (Bacillus cereus, B. subtilis, Staphylococcus aureus) and Gram negative bacteria (Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae) and fungi (Candida albicans, Cryptococcus neoformans). Walnut leaves selectively inhibited the growth of Gram positive bacteria, being B. cereus the most susceptible one (MIC 0.1 mg/mL). Gram negative bacteria and fungi were resistant to the extracts at 100 mg/mL. Lara walnut leaves were also submitted to antibacterial assays using 18 clinical isolates of Staphylococcus sp. Antioxidant activity was accessed by the reducing power assay, the scavenging effect on DPPH (2,2-diphenyl-1-picrylhydrazyl) radicals and b-carotene linoleate model system. In a general way, all of the studied walnut leaves cultivars presented high antioxidant activity (EC50 values lower than 1 mg/mL), being Cv. Lara the most effective one.en
dc.identifier.citationPereira, J.A.; Oliveira, Ivo; Sousa, A.; Valentão, P.; Andrade, P.B.; Ferreira, Isabel C.F.R.; Ferreres, F.; Bento, Albino; Seabra, R.M.; Estevinho, Leticia M. (2007). Walnut (Juglans regia L.) leaves: phenolic compounds, antimicrobial activity ans antioxidant potential of different cultivars. Food and Chemical Toxicology. ISSN 0278-6915. 45:11, p. 2287-2295en
dc.identifier.doi10.1016/j.fct.2007.06.004
dc.identifier.issn0278-6915
dc.identifier.urihttp://hdl.handle.net/10198/719
dc.language.isoengen
dc.peerreviewedyes
dc.publisherElsevieren
dc.subjectWalnut leavesen
dc.subjectPhenolicsen
dc.subjectAntimicrobial activityen
dc.subjectAntioxidant propertiesen
dc.titleWalnut (Juglans regia L.) leaves: phenolic compounds, antimicrobial activity ans antioxidant potential of different cultivarsen
dc.typejournal article
dspace.entity.typePublication
person.familyNamePereira
person.familyNameFerreira
person.familyNameBento
person.familyNameEstevinho
person.givenNameJosé Alberto
person.givenNameIsabel C.F.R.
person.givenNameAlbino
person.givenNameLetícia M.
person.identifier144781
person.identifier.ciencia-id611F-80B2-A7C1
person.identifier.ciencia-id9418-CF95-9919
person.identifier.ciencia-idD516-325A-9AD7
person.identifier.ciencia-idBA14-09D6-A406
person.identifier.orcid0000-0002-2260-0600
person.identifier.orcid0000-0003-4910-4882
person.identifier.orcid0000-0001-5215-785X
person.identifier.orcid0000-0002-9249-1948
person.identifier.ridL-6798-2014
person.identifier.ridE-8500-2013
person.identifier.ridN-9706-2016
person.identifier.scopus-author-id57204366348
person.identifier.scopus-author-id36868826600
person.identifier.scopus-author-id35247694000
person.identifier.scopus-author-id6506577664
rcaap.rightsopenAccess
rcaap.typearticleen
relation.isAuthorOfPublication7932162e-a2da-4913-b00d-17babbe51857
relation.isAuthorOfPublicationbd0d1537-2e03-41fb-b27a-140af9c35db8
relation.isAuthorOfPublication233115be-9d46-49d0-8b7d-2d64406d64a0
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relation.isAuthorOfPublication.latestForDiscovery233115be-9d46-49d0-8b7d-2d64406d64a0

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