A Graphene‐based Electrochemical Sensor for the Individual, Selective and Simultaneous Determination of Total Chlorogenic Acids, Vanillin and Caffeine in Food and Beverage Samples. Issue 9 (15th May 2018)

• Record Type: Journal Article
• Authors: Yiğit, Aydın; Alpar, Nurcan; Yardım, Yavuz; Çelebi, Metin; Şentürk, Zühre
• Is Part Of: Electroanalysis. Volume 30:Issue 9(2018)
• Page Start: 2011
• Page End: 2020
• Publication Date: 2018-05-15
• Subjects: 5-O-Caffeoylquinic acid -- Vanillin -- Caffeine -- Graphene modified glassy carbon electrode -- Commercial food and beverage samples; Electrochemical analysis -- Periodicals; Chemistry, Analytical -- Periodicals; Electrochemistry -- Periodicals; 543.4
• DOI: 10.1002/elan.201800229
• Languages: English
• ISSNs: 1040-0397

Abstract

Abstract: 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 30 s accumulation under open‐circuit voltage, the electrochemical oxidation peaks appeared at +0.53, 0.83 and 1.39 V in phosphate buffer pH 2.5, and good linear current responses were obtained with detection limits of 4.4×10 −9, 5.0×10 −7, and 3.0×10 −7 M for 5‐CQA, VAN and CAF, respectively. The potential applicability of the proposed method was illustrated in commercial food and beverage samples. Abstract :