Determination of Quercetin by a Siloxane-Polyester/Poly-L-Lysine Nanocomposite Modified Glassy Carbon Electrode

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dc.contributor.authorPereira, Elaine Renata de Castro Viana [UNESP]
dc.contributor.authorBessegato, Guilherme Garcia [UNESP]
dc.contributor.authorYamanaka, Hideko [UNESP]
dc.contributor.authorZanoni, Maria Valnice Boldrin [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T17:03:00Z
dc.date.available2018-12-11T17:03:00Z
dc.date.issued2016-06-12
dc.description.abstractPoly-L-lysine incorporated in the nanocavities of polysiloxane-poly(propylene) oxide is reported as an electrochemical sensor for quercetin. A glassy carbon electrode coated by poly-L-lysine/polysiloxane-poly(propylene) oxide accumulated quercetin through hydrogen bonding in pH 2 ethanol/Britton-Robinson buffer. The catecol oxidation was monitored at 0.45 V as a reversible two electron peak. The voltammetric response using the film electrode was 80% higher compared to a bare electrode. Square wave voltammetry was employed using an accumulation time of 8 min and a linear relationship was obtained for concentrations of quercetin from 1.0 × 10−8 mol L−1 to 1.0 × 10−6 mol L−1. The limit of detection was 2.76 ± 0.5 × 10−9 mol L−1. The method was employed to determine quercetin in green tea, but did not show selectivity to catechin, which was oxidized at a similar potential. The measurements were validated by high-performance liquid chromatography.en
dc.description.affiliationDepartment of Analytical Chemistry Institute of Chemistry Universidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP
dc.description.affiliationUnespDepartment of Analytical Chemistry Institute of Chemistry Universidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 10449-7
dc.description.sponsorshipIdFAPESP: 18357
dc.format.extent1398-1411
dc.identifierhttp://dx.doi.org/10.1080/00032719.2015.1104323
dc.identifier.citationAnalytical Letters, v. 49, n. 9, p. 1398-1411, 2016.
dc.identifier.doi10.1080/00032719.2015.1104323
dc.identifier.file2-s2.0-84969835250.pdf
dc.identifier.issn1532-236X
dc.identifier.issn0003-2719
dc.identifier.scopus2-s2.0-84969835250
dc.identifier.urihttp://hdl.handle.net/11449/172987
dc.language.isoeng
dc.relation.ispartofAnalytical Letters
dc.relation.ispartofsjr0,344
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectCatechol
dc.subjectpoly-L-lysine
dc.subjectpolysiloxane-poly(propylene) oxide polymer
dc.subjectquercetin
dc.subjectvoltammetric sensor
dc.titleDetermination of Quercetin by a Siloxane-Polyester/Poly-L-Lysine Nanocomposite Modified Glassy Carbon Electrodeen
dc.typeArtigo

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