Rapid determination of total polyphenolic content in tea samples based on caffeic acid voltammetric behaviour on a disposable graphite electrode
David, Iulia Gabriela and Bizgan, Ana-Maria Cristina and Popa, Dana Elena and Buleandra, Mihaela and Moldovan, Zenovia and Badea, Irinel Adriana and Tekiner, Tuğçe Ayça and Başağa, Hüveyda and Ciucu, Anton A. (2015) Rapid determination of total polyphenolic content in tea samples based on caffeic acid voltammetric behaviour on a disposable graphite electrode. Food Chemistry, 173 . pp. 1059-1065. ISSN 0308-8146 (Print) 1873-7072 (Online)
Official URL: http://dx.doi.org/10.1016/j.foodchem.2014.10.139
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.
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