title: Highly sensitive detection of melamine based on gemini surfactant using enhanced resonance Rayleigh scattering signals.
abstract: We present here a resonance Rayleigh scattering (RRS) spectrum method for the determination of melamine at the nanogram level using a gemini surfactant (disodium 4-dodecyl-2,4'-oxydibenzenesulfonate, DDOF). It was found that DDOF could react with cationic melamine to form an ion-association complex, which induced the enhancement of RRS intensity and the appearance of a new RRS spectrum in acetate buffer (pH 3.6). The RRS spectral characteristics of the melamine-DDOF system, the optimum conditions of the reaction, and the influencing factors have been investigated. Under optimum conditions, the enhanced RRS intensity was proportional to the concentration of melamine in the range of 0.38-6.30 μg/mL. The method has high sensitivity, and the detection limit for melamine is 8.48 ng/mL. Furthermore, the reaction mechanism and the reasons of RRS enhancement were evaluated.
authors.affiliation: Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Jiang Xue
authors.initials: JX
authors.lastname: Dong
authors.forename: Nian Bing
authors.initials: NB
authors.lastname: Li
authors.forename: Hong Qun
authors.initials: HQ
authors.lastname: Luo
mesh_terms: D001557:Benzenesulfonates / Q000737:chemistry*; D057230:Limit of Detection; D009994:Osmolar Concentration; D012542:Scattering, Radiation; D013057:Spectrum Analysis / Q000379:methods; D013501:Surface-Active Agents / Q000737:chemistry*; D014227:Triazines / Q000032:analysis*
chemical_list: D001557:Benzenesulfonates; D013501:Surface-Active Agents; D014227:Triazines; C011907:melamine