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Volatile-Oils Composition, and Bioactivity of the Essential Oils of Plectranthus barbatus, P. neochilus, and P. ornatus Grown in Portugal

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dc.contributor.authorMota, L.
dc.contributor.authorFigueiredo, A. C.
dc.contributor.authorPedro, L. G.
dc.contributor.authorBarroso, J. G.
dc.contributor.authorMiguel, Maria Graça
dc.contributor.authorFaleiro, Leonor
dc.contributor.authorAscensão, L.
dc.date.accessioned2015-06-15T14:53:37Z
dc.date.available2015-06-15T14:53:37Z
dc.date.issued2014
dc.description.abstractVolatile-oils chemical composition and bioactivity of the essentail oils from Plectranthus barbatus, P. neochilus, and P. ornatus (Lamiaceae) were assessed. Aerial parts from these three related Plectranthus species were collected from cultivated plants grown in Portugal, during vegetative and flowering phases. Volatiles, isolated by distillationextraction, were analyzed by GC and GC/MS. Monoterpene hydrocarbons (12-74%) and sesquiterpene hydrocarbons (4-45%) constituted the main fractions in all volatiles. -Pinene (3; 12-67%), oct-1-en-3-ol (6; traces-28%), -pinene (7; 0.1-22%), and -caryophyllene (50; 7-12%) dominated P. barbatus volatiles. P. neochilus major volatile components were -terpenyl acetate (41; traces-48%), -thujone (2; 2-28%), -caryophyllene (50; 2-28%), -pinene (7; 1-25%), and -pinene (3; 1-19%). Oct-1-en-3-ol (6; 13-31%), -pinene (7; 11-24%), -pinene (3; 11-19%), and -caryophyllene (50; traces-11%) were the main constituents from P. ornatus volatiles. These chemical compositions were rather different from those previously found for specimens harvested in Africa and Brazil. Moreover, the volatiles from the flowers are herewith reported for the first time. Essential oils, isolated by hydrodistillation from leaves and stems, showed a yellowish color and unpleasant odor, with yields ranging from 0.08% to 0.84% (v/dry weight). Antioxidant and antimicrobial activities of the essential oils were evaluated by DPPH. and TBARS assays, and agar disc-diffusion method, respectively. Results showed low or moderate antioxidant capacity and significant antimicrobial activity against Gram-positive bacteria.
dc.identifier.doihttps://dx.doi.org/10.1002/cbdv.201300161
dc.identifier.issn1612-1872
dc.identifier.issn1612-1880
dc.identifier.otherAUT: MFA00238; MGM00322;
dc.identifier.urihttp://hdl.handle.net/10400.1/6363
dc.language.isoeng
dc.peerreviewedyes
dc.publisherWiley
dc.relation.isbasedonP-009-H63
dc.titleVolatile-Oils Composition, and Bioactivity of the Essential Oils of Plectranthus barbatus, P. neochilus, and P. ornatus Grown in Portugal
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage732
oaire.citation.startPage719
oaire.citation.titleChemistry and Biodiversity
oaire.citation.volume11
person.familyNameMiguel
person.familyNameFaleiro
person.givenNameMaria da Graça
person.givenNameMaria Leonor
person.identifier252666
person.identifier.ciencia-id6110-6FE7-DF28
person.identifier.ciencia-id281D-5E01-F09A
person.identifier.orcid0000-0003-2507-4228
person.identifier.orcid0000-0002-3878-6948
person.identifier.scopus-author-id35562054500
person.identifier.scopus-author-id6507927018
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication2507350f-9e60-4d4a-a096-53e58d93549c
relation.isAuthorOfPublication5361e29a-3b79-4ce8-9f87-0c667d60588d
relation.isAuthorOfPublication.latestForDiscovery5361e29a-3b79-4ce8-9f87-0c667d60588d

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