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Sensitive electrochemiluminescence detection of matrine based on Ru(bpy)₃²⁺ and mesoporous silica nanosphere modified electrodes
- Miao, Chongchong, Wu, Beina, Cao, Hongmei, Jia, Nengqin
- Analytical methods 2014 v.6 no.21 pp. 8592-8597
- amines, analytical methods, detection limit, electrochemiluminescence, electrochemistry, electrodes, nanospheres, pH, porous media, silica, standard deviation
- In this paper, a simple and sensitive ECL sensor based on mesoporous silica (mSiO₂) nanospheres was constructed for the quantitative detection of matrine (MT). Electrochemical and ECL behaviors were investigated with Ru(bpy)₃²⁺/mSiO₂/Nafion modified electrodes and the sensor was used for the detection of matrine under a Ru(bpy)₃²⁺/tripropylamine (TPA) system. The influence of the pH and scan rate was studied. Under optimum conditions the experimental results indicated that the sensor had an excellent ECL efficiency and showed a good response to the concentration of MT with a linear range from 1.5 × 10⁻⁶ M to 2.0 × 10⁻³ M. The lowest detection limit was 0.5 μM with a relative standard deviation of 5.47%. This constructed ECL sensor could be applicable for real sample analysis.