Antioxidant Properties of Plant Extracts: an EPR and DFT Comparative Study of the Reaction with DPPH, TEMPOL and Spin Trap DMPO

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dc.contributor.authordos Santos, Adevailton Bernardo
dc.contributor.authorSiqueira Silva, Dulce Helena [UNESP]
dc.contributor.authorBolzani, Vanderlan da Silva [UNESP]
dc.contributor.authorSantos, Luciana Avila [UNESP]
dc.contributor.authorSchmidt, Tome Mauro
dc.contributor.authorBaffa, Oswaldo
dc.contributor.institutionUniversidade Federal de Uberlândia (UFU)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T14:20:14Z
dc.date.available2014-05-20T14:20:14Z
dc.date.issued2009-01-01
dc.description.abstractThis work presents a comparative study of the antioxidant activity of extracts from nine plant species belonging to the Brazilian flora - Swartzia langsdorffii, Machaerium villosum, Pterogyne nitens, Pera glabrata, Aegiphyla sellowiana, Copaifera langsdorffii, Chrysophyllum inornatum, Iryanthera juruensis, Didymopanax venosum - acting on the free-radicals DPPH (2,2-diphenyl-1-pierylhydrazyl) and TEMPOL (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy-1-oxyl) by electron paramagnetic resonance (EPR), and acting on the hydroxyl radical (OH circle) by the spin-trapping technique generated by a Fenton reaction. Results showed that the extracts of Iryanthera juruensis and Chrysophyllum inornatum display the strongest antioxidant activities. The results of scavenging tests were clarified by computational calculations - density functional theory (DFT), local density approximation (LDA) with SIESTA code - indicating that the energy released in the reduction reaction of TEMPOL is less than DPPH. Due to its availability and cost DPPH is more often used in these tests than TEMPOL, however TEMPOL should be considered when studying processes dealing with smaller energies.en
dc.description.affiliationUniversidade Federal de Uberlândia (UFU), Fac Ciencias Integradas Pontol, BR-38302000 Ituiutaba, MG, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.description.affiliationUniversidade Federal de Uberlândia (UFU), Inst Fis, BR-38400902 Uberlandia, MG, Brazil
dc.description.affiliationUniv São Paulo, Dept Fis & Matemat, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14040901 Ribeirao Preto, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent1483-1492
dc.identifierhttp://dx.doi.org/10.1590/S0103-50532009000800015
dc.identifier.citationJournal of The Brazilian Chemical Society. São Paulo: Soc Brasileira Quimica, v. 20, n. 8, p. 1483-1492, 2009.
dc.identifier.doi10.1590/S0103-50532009000800015
dc.identifier.fileS0103-50532009000800015.pdf
dc.identifier.issn0103-5053
dc.identifier.lattes4702004904231248
dc.identifier.lattes4484083685251673
dc.identifier.scieloS0103-50532009000800015
dc.identifier.urihttp://hdl.handle.net/11449/26080
dc.identifier.wosWOS:000271226900015
dc.language.isoeng
dc.publisherSoc Brasileira Quimica
dc.relation.ispartofJournal of the Brazilian Chemical Society
dc.relation.ispartofjcr1.444
dc.relation.ispartofsjr0,357
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectEPRen
dc.subjectTEMPOLen
dc.subjectDPPHen
dc.subjectDMPOen
dc.subjectDFTen
dc.titleAntioxidant Properties of Plant Extracts: an EPR and DFT Comparative Study of the Reaction with DPPH, TEMPOL and Spin Trap DMPOen
dc.typeArtigo
dcterms.rightsHolderSoc Brasileira Quimica
unesp.author.lattes4702004904231248
unesp.author.lattes4484083685251673
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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