Enhanced electrochemiluminescence based on Ru(bpy)32+-doped silica nanoparticles and graphene composite for analysis of melamine in milk |
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| Affiliation: | 1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China;2. University of the Chinese Academy of Sciences, China;1. Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, PR China;1. CAS Key Laboratory of Soft Matter Chemistry, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, PR China;2. Institute of Cardiovascular Disease, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210029, PR China;1. Department of Chemistry, Institute for Advanced Studies in Basic Sciences, P.O. Box 45195-1159, Gava Zang, Zanjan, Iran;2. Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran;3. Department of Biochemistry and Structural Biology, Lund University, P.O. Box 124, SE-22100 Lund, Sweden;1. Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Key Laboratory of Guangxi Colleges and Universities for food safety and pharmaceutical analytical chemistry, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530008, PR China;2. State Key Laboratory of Agricultural Microbiology, College of Science, College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China |
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| Abstract: | A sensitive electrochemiluminescence (ECL) sensor for melamine analysis was fabricated based on Ru(bpy)32+-doped silica (Ru(bpy)32+@SiO2) nanoparticles and graphene composite. Spherical Ru(bpy)32+@SiO2 nanoparticles with uniform size about 55 nm were prepared by the reverse microemulsion method. Since per Ru(bpy)32+@SiO2 nanoparticle encapsulated a great deal of Ru(bpy)32+, the ECL intensity has been greatly enhanced, which resulted in high sensitivity. Due to its extraordinary electric conductivity, graphene improved the conductivity and accelerated the electron transfer rate. In addition, graphene could work as electronic channel improving the efficient luminophor amount participating in the ECL reaction, which further enhanced the ECL signal. This proposed sensor was used to melamine analysis and the ECL intensity was proportional to logarithmic melamine concentration range from 1 × 10−13 M to 1 × 10−8 M with the detect limit as low as 1 × 10−13 M. In application to detect melamine in milk, satisfactory recoveries could be obtained, which indicated this sensor having potential application in melamine analysis in real samples. |
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| Keywords: | Electrochemiluminescence Graphene Melamine |
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