1. Rapid determination of total polyphenolic content in tea samples based on caffeic acid voltammetric behaviour on a disposable graphite electrode.
- Author
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David IG, Bizgan AM, Popa DE, Buleandra M, Moldovan Z, Badea IA, Tekiner TA, Basaga H, and Ciucu AA
- Subjects
- Electrochemical Techniques methods, Caffeic Acids chemistry, Electrochemical Techniques instrumentation, Electrodes, Graphite, Polyphenols analysis, Tea chemistry
- 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., (Copyright © 2014 Elsevier Ltd. All rights reserved.)
- Published
- 2015
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