title: Highly-sensitive and rapid determination of sunset yellow using functionalized montmorillonite-modified electrode.
abstract: Montmorillonite calcium (MMT-Ca) was functionalized with cetyltrimethylammonium bromide (CTAB) via cationic exchange effects. Compared with MMT-Ca, the resulting CTAB functionalized MMT-Ca (CTAB/MMT-Ca) greatly increased the oxidation peak current of sunset yellow, indicative of strong signal enhancement effects. The oxidation mechanism was studied, and one electron was transferred during the oxidation of sunset yellow. The influences of pH value, mass ratio of CTAB to MMT-Ca, amount of CTAB/MMT-Ca, and accumulation time were studied on the oxidation signal of sunset yellow. As a result, a highly-sensitive, rapid and simple electrochemical method was newly developed for the determination of sunset yellow. The linear ranger was from 2.5 to 200 nM, and the detection limit was as low as 0.71 nM after 1-min accumulation. This method was applied in soft drink samples, and the detected results consisted with the values that obtained by high-performance liquid chromatography.
authors.affiliation: Department of Pharmacy, Renmin Hospital of Wuhan University, Wuhan 430060, China.
authors.forename: Yiyan
authors.initials: Y
authors.lastname: Songyang
authors.affiliation: Department of Pharmacy, Renmin Hospital of Wuhan University, Wuhan 430060, China.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Pharmacy, Wuhan University, Wuhan 430071, China.
authors.forename: Shunlan
authors.initials: S
authors.lastname: Xie
authors.affiliation: Department of Pharmacy, Renmin Hospital of Wuhan University, Wuhan 430060, China.
authors.forename: Haohua
authors.initials: H
authors.lastname: Hao
authors.affiliation: Department of Pharmacy, Renmin Hospital of Wuhan University, Wuhan 430060, China. Electronic address: songjcwhu@163.com.
authors.forename: Jinchun
authors.initials: J
authors.lastname: Song
mesh_terms: D001391:Azo Compounds / Q000032:analysis*; D001546:Bentonite / Q000737:chemistry*; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D055664:Electrochemical Techniques; D004566:Electrodes; D010084:Oxidation-Reduction; D012680:Sensitivity and Specificity
chemical_list: D001391:Azo Compounds; D002593:Cetrimonium Compounds; D001546:Bentonite; C005842:6-hydroxy-5-((p- sulfophenyl)azo)-2-naphthalenesulfonic acid disodium salt; D000077286:Cetrimonium
keywords: Electrochemical detection; Functionalized montmorillonite; High sensitivity; Modified electrode; Sunset yellow