title: Sensitive and rapid determination of quinoline yellow in drinks using polyvinylpyrrolidone-modified electrode.
abstract: A novel electrochemical sensor using polyvinylpyrrolidone (PVP)-modified carbon paste electrode was developed for the sensitive and rapid determination of quinoline yellow. In 0.1M, pH 6.5 phosphate buffer, an irreversible oxidation wave at 0.97 V was observed for quinoline yellow. PVP exhibited strong accumulation ability to quinoline yellow, and consequently increased the oxidation peak current of quinoline yellow remarkably. The effects of pH value, amount of PVP, accumulation potential and time were studied on the oxidation signals of quinoline yellow. The linear range was from 5×10(-8) to 1×10(-6) M, and the limit of detection was evaluated to be 2.7×10(-8) M. It was used to detect quinoline yellow in different drink samples, and the results consisted with the values that obtained by high-performance liquid chromatography.
authors.affiliation: Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province, School of Chemistry and Environmental Engineering, Hubei Minzu University, Enshi 445000, China. Electronic address: zhang_shenghui@163.com.
authors.forename: Shenghui
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province, School of Chemistry and Environmental Engineering, Hubei Minzu University, Enshi 445000, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Shi
authors.affiliation: Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province, School of Chemistry and Environmental Engineering, Hubei Minzu University, Enshi 445000, China.
authors.forename: Jinshou
authors.initials: J
authors.lastname: Wang
mesh_terms: D001628:Beverages / Q000032:analysis*; D002244:Carbon / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D004566:Electrodes; D005504:Food Analysis / Q000379:methods; D010084:Oxidation-Reduction; D011205:Povidone; D011804:Quinolines / Q000032:analysis*
chemical_list: D011804:Quinolines; C019303:quinoline yellow; D002244:Carbon; D011205:Povidone
keywords: Electrochemical determination; Food analysis; Polyvinylpyrrolidone (PVP); Quinoline yellow