title: A novel solid-state electrochemiluminescence sensor for melamine with Ru(bpy)3(2+)/mesoporous silica nanospheres/Nafion composite modified electrode.
abstract: A novel melamine electrochemiluminescence (ECL) sensor was developed based on mesoporous SiO(2) nanospheres/Ru(bpy)(3)(2+)/Nafion modified electrodes. The homogeneous mesoporous silica nanospheres, synthesized using modified Stöber sol-gel process, were characterized by Field Emission Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscopy (TEM) and Brunauer-Emmett-Teller (BET). The ECL and electrochemistry of the modified electrodes were investigated with tri-n-propylamine (TPA) as the coreactant. Furthermore, the mesporous SiO(2) nanospheres/Ru(bpy)(3)(2+)-based modified electrodes were used for ECL determination of melamine. The analytical performances of this ECL sensor for melamine based on its enhancement ECL emission of Ru(bpy)(3)(2+) were investigated. The results indicated that the sensor exhibited excellent performance during melamine determination with a wide linear range (7.81×10(-9)-5×10(-6) M), low detection limit (2.6×10(-9) M). The high sensitivity and stability mainly resulted from the high surface area and special structure of the mesoporous silica nanospheres. The proposed ECL approach was used to analyze the melamine content in powdered milk with satisfactory results.
authors.affiliation: The Education Ministry Key Laboratory of Resource Chemistry, Department of Chemistry, College of Life and Environmental Sciences, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, China.
authors.forename: Hongmei
authors.initials: H
authors.lastname: Cao
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Hu
authors.forename: Chenyi
authors.initials: C
authors.lastname: Hu
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Nengqin
authors.initials: N
authors.lastname: Jia
mesh_terms: D000818:Animals; D015374:Biosensing Techniques / Q000295:instrumentation; D002417:Cattle; D003217:Conductometry / Q000295:instrumentation*; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005465:Fluorocarbon Polymers / Q000737:chemistry; D005504:Food Analysis / Q000295:instrumentation*; D005506:Food Contamination / Q000032:analysis*; D008163:Luminescent Measurements / Q000295:instrumentation*; D008892:Milk / Q000737:chemistry*; D054118:Nanospheres / Q000737:chemistry*; D016062:Porosity; D015203:Reproducibility of Results; D012413:Rubidium / Q000737:chemistry; D012666:Semiconductors; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000737:chemistry; D014227:Triazines / Q000737:chemistry*
chemical_list: D005465:Fluorocarbon Polymers; D014227:Triazines; C040402:perfluorosulfonic acid; D012822:Silicon Dioxide; D012413:Rubidium; C011907:melamine