A Graphene-based Electrochemical Sensor for the Individual, Selective and Simultaneous Determination of Total Chlorogenic Acids, Vanillin and Caffeine in Food and Beverage Samples


Yiğit A., Alpar N., Yardım Y. , Çelebi M. , Senturk Z.

ELECTROANALYSIS, cilt.30, ss.2011-2020, 2018 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 30 Konu: 9
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1002/elan.201800229
  • Dergi Adı: ELECTROANALYSIS
  • Sayfa Sayıları: ss.2011-2020

Özet

An electrochemical sensor based on the electrocatalytic activity of graphene (GR) was prepared, and used for the individual, selective and simultaneous determination of 5-O-Caffeoylquinic acid (5-CQA) that is major compound of chlorogenic acids in coffee, vanillin (VAN) and caffeine (CAF). The electrochemical behaviors of these compounds on GR modified glassy carbon electrode (GR/GCE) were investigated by cyclic voltammetry and square-wave adsorptive stripping voltammetry. By using stripping conditions after 30s accumulation under open-circuit voltage, the electrochemical oxidation peaks appeared at +0.53, 0.83 and 1.39V in phosphate buffer pH2.5, and good linear current responses were obtained with detection limits of 4.4x10(-9), 5.0x10(-7), and 3.0x10(-7)M for 5-CQA, VAN and CAF, respectively. The potential applicability of the proposed method was illustrated in commercial food and beverage samples.