Yigit, AydinAlpar, NurcanYardim, YavuzCelebi, MetinSenturk, Zuehre2025-05-102025-05-1020181040-03971521-410910.1002/elan.2018002292-s2.0-85052951891https://doi.org/10.1002/elan.201800229https://hdl.handle.net/20.500.14720/5969Celebi, Metin/0000-0003-1475-8878; Senturk, Zuhre/0000-0002-0356-9345; Yardim, Yavuz/0000-0002-9587-096XAn 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.eninfo:eu-repo/semantics/closedAccess5-O-Caffeoylquinic AcidVanillinCaffeineGraphene Modified Glassy Carbon ElectrodeCommercial Food And Beverage SamplesArticle309Q2Q220112020WOS:000443938300016