Novel PVC-based coated graphite electrode for selective determination of quinoline yellow

Abstract

Novel coated graphite electrode (CGE) for the determination of quinoline yellow (QY), an artificial food colorant, was evaluated based on the use of tetraphenylphosponium-QY ion-pair complex as the electroactive substance. The electrode revealed linear emf-pQY response over wide concentration ranges (1.0 × 10 -1 ~ 5.0 × 10 -5 M ) with a slope -30.1 ± 0.2 mV decade -1 and a limit of detection of 4.0 × 10 -5 M. The electrode showed good stability, reproducibility and fast response (<5 s). It can be used in wide pH range (4.7-10.7) and was successfully applied to determination of quinoline yellow in artificial mixtures and commercial soft drinks. The results obtained with the electrode were in good agreement with the value obtained by using HPLC measurements, as an official method.

Rapid detection of quinoline yellow in soft drinks using polypyrrole/single-walled carbon nanotubes composites modified glass carbon electrode

“…Electroanalytical technology also gained an important place in the detection of quinoline yellow due to its simplicity, high sensitivity and versatility. For instance, a coated graphite electrode was reported for the detection of quinoline yellow [8]. The linear range was 0.04-0.08 M, and the detection limit was 32.96 lM.…”

Sensitive and rapid determination of quinoline yellow in drinks using polyvinylpyrrolidone-modified electrode

“…However, the mercury electrode is toxic and can lead to environmental pollution. To overcome the disadvantages of mercury electrodes, nonmercury electrodes, such as a coated graphite electrode (Rouhani & Haji-ghasemi, 2009) and a carbon nanotubes-modified glassy carbon electrode (Zhao, Zhang, Wu, Chen, & Zhou, 2011), have been developed for the electrochemical determination of quinoline yellow. However, to the best of our knowledge, electrochemical detection of quinoline yellow using PVP-modified electrode is still missing.…”

Detection of Quinoline Using Ammonia Plasma-Functionalised Multi-Walled Carbon Nanotubes and Application to Real Samples

“…As shown in Table 1, the LOD of the modified electrode was compared with other reported previously (Cinti et al, 2014;Hosu et al, 2016;Piovesan and Spinelli, 2014;Rouhani and Haji-Ghasemi, 2009;Stevic et al, 2012). It can be suggested that the modified electrode in this work has better sensitivity.…”