title: Rapid determination of total polyphenolic content in tea samples based on caffeic acid voltammetric behaviour on a disposable graphite electrode.
abstract: The present paper describes the voltammetric behaviour and the quantitative determination of caffeic acid (CA) on a disposable pencil graphite electrode (PGE). The anodic peak current of CA recorded by differential pulse voltammetry (DPV) varies linearly with CA concentration in the range 1×10(-7)-3×10(-3) M. The detection and quantification limits were 8.83×10(-8) M and 2.94×10(-7) M caffeic acid, respectively. The mean recoveries of CA from Turkish green, white and black teas were 98.30%, 99.57% and 91.46%. For these three tea types the corresponding total polyphenolic contents (TPCs) evaluated by DPV on PGE were 35.81, 34.59 and 31.21 mg caffeic acid equivalent/g tea, respectively. These TPC values were in good accordance with those obtained by the Folin-Ciocalteu method. The developed DPV on PGE method constitutes a simple and inexpensive tool for the rapid assessment of TPC of tea samples.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Av., 030018, District 3, Bucharest, Romania. Electronic address: gabrielaiulia.david@g.unibuc.ro.
authors.forename: Iulia Gabriela
authors.initials: IG
authors.lastname: David
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Av., 030018, District 3, Bucharest, Romania.
authors.forename: Ana-Maria Cristina
authors.initials: AM
authors.lastname: Bizgan
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Av., 030018, District 3, Bucharest, Romania.
authors.forename: Dana Elena
authors.initials: DE
authors.lastname: Popa
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Av., 030018, District 3, Bucharest, Romania.
authors.forename: Mihaela
authors.initials: M
authors.lastname: Buleandra
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Av., 030018, District 3, Bucharest, Romania.
authors.forename: Zenovia
authors.initials: Z
authors.lastname: Moldovan
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Av., 030018, District 3, Bucharest, Romania.
authors.forename: Irinel Adriana
authors.initials: IA
authors.lastname: Badea
authors.affiliation: Biological Sciences and Bioengineering Program, Sabanci University, 34457 Orhanlı-Tuzla, Istanbul, Turkey.
authors.forename: Tuğçe Ayça
authors.initials: TA
authors.lastname: Tekiner
authors.affiliation: Biological Sciences and Bioengineering Program, Sabanci University, 34457 Orhanlı-Tuzla, Istanbul, Turkey.
authors.forename: Huveyda
authors.initials: H
authors.lastname: Basaga
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Av., 030018, District 3, Bucharest, Romania.
authors.forename: Anton A
authors.initials: AA
authors.lastname: Ciucu
mesh_terms: D002109:Caffeic Acids / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000295:instrumentation* / Q000379:methods; D004566:Electrodes; D006108:Graphite; D059808:Polyphenols / Q000032:analysis*; D013662:Tea / Q000737:chemistry*
chemical_list: D002109:Caffeic Acids; D059808:Polyphenols; D013662:Tea; D006108:Graphite; C040048:caffeic acid
keywords: Caffeic acid; Pencil graphite electrode; Tea; Total polyphenolic content