title: Trace analysis of Ponceau 4R in soft drinks using differential pulse stripping voltammetry at SWCNTs composite electrodes based on PEDOT:PSS derivatives.
abstract: Ponceau 4R, an edible synthetic colorant used in drinks, syrups, and sweets, has been successfully detected using differential pulse voltammetry at a single-walled carbon nanotubes-modified composite electrode based on poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) and two derivatives thereof. The electrochemical parameters of three Ponceau 4R sensors, such as pH value, pre-concentration time, and scan rate, have been optimized, and their electrochemical performances have been compared. A poly(acrylate-modified 3,4-ethylenedioxythiophene-co-3,4-ethylenedioxythiophene):poly(styrene sulfonate)-single-walled carbon nanotubes-poly(vinyl alcohol)-modified electrode showed the best electrocatalytic activity, with the highest response current, lowest detection limit (1.8 nm), widest linear range (0.0055-110.6 μm), and best sensing stability. Additionally, the modified electrode has also been successfully employed for real sample analysis with soft drinks. Satisfactory results were obtained, demonstrating this to be an easy and effective approach for trace analysis of Ponceau 4R in food samples.
authors.affiliation: Key Laboratory of Applied Chemistry, Jiangxi Agricultural University, Nanchang 330045, PR China; Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology, Normal University, Nanchang 330013, PR China.
authors.forename: Zifei
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Key Laboratory of Applied Chemistry, Jiangxi Agricultural University, Nanchang 330045, PR China; Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology, Normal University, Nanchang 330013, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology, Normal University, Nanchang 330013, PR China.
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Key Laboratory of Applied Chemistry, Jiangxi Agricultural University, Nanchang 330045, PR China; Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology, Normal University, Nanchang 330013, PR China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology, Normal University, Nanchang 330013, PR China.
authors.forename: Xuemin
authors.initials: X
authors.lastname: Duan
authors.affiliation: Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology, Normal University, Nanchang 330013, PR China. Electronic address: xujingkun@tsinghua.org.cn.
authors.forename: Jingkun
authors.initials: J
authors.lastname: Xu
authors.affiliation: Key Laboratory of Applied Chemistry, Jiangxi Agricultural University, Nanchang 330045, PR China. Electronic address: wenyangping1980@gmail.com.
authors.forename: Yangping
authors.initials: Y
authors.lastname: Wen
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry*; D002244:Carbon; D002253:Carbonated Beverages / Q000032:analysis*; D004566:Electrodes; D009282:Naphthalenesulfonates / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D019086:Bridged Bicyclo Compounds, Heterocyclic; D009282:Naphthalenesulfonates; D011108:Polymers; C121383:poly(3,4-ethylene dioxythiophene); D002244:Carbon; C576297:ponceau 4R
keywords: Carbon nanotube; Food additive; Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) derivatives; Ponceau 4R; Sensor