title: Sensitive Voltammetric Determination of Natural Flavonoid Quercetin on a Disposable Graphite Lead.
abstract: In this paper, a pencil graphite electrode was pretreated using chronoamperometry technique in phosphate buffer solution (pH=7.0) for sensitive determination of quercetin. Oxidation of quercetin was investigated using pretreated pencil graphite electrode and anodic stripping differential pulse voltammetry. Under optimal conditions, the anodic current of quercetin exhibited linear response to its concentration in the range from 0.001 to 1.5 µmol/L with the limit of detection of 0.3·10-3µmol/L. The proposed method was successfully applied for the determination of quercetin in cranberry and blackcurrant juices with recovery rate from 93.2 to 94.7%. Solid-phase extraction was found to be necessary prior to voltammetric determination of quercetin in fruit juice samples using pretreated pencil graphite electrode.
authors.affiliation: University of Pardubice, Studentska 573, CZ-53210 Pardubice, Czech Republic.
authors.forename: Dai Long
authors.initials: DL
authors.lastname: Vu
authors.affiliation: University of Pardubice, Studentska 573, CZ-53210 Pardubice, Czech Republic.
authors.forename: Simona
authors.initials: S
authors.lastname: Žabčíková
authors.affiliation: University of Pardubice, Studentska 573, CZ-53210 Pardubice, Czech Republic.
authors.forename: Libor
authors.initials: L
authors.lastname: Červenka
authors.affiliation: Canakkale Onsekiz Mart University, Mart University 18, TR-17100 Canakkale, Turkey.
authors.forename: Bensu
authors.initials: B
authors.lastname: Ertek
authors.affiliation: Canakkale Onsekiz Mart University, Mart University 18, TR-17100 Canakkale, Turkey.
authors.forename: Yusuf
authors.initials: Y
authors.lastname: Dilgin
keywords: fruit juices; pencil graphite electrode; quercetin; voltammetry