Sensitive electrochemiluminescence detection of matrine based on Ru(bpy)3~(2+) and mesoporous silica nanosphere modified electrodes

摘要

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)3~(2+)/mSiO2/Nafion modified electrodes and the sensor was used for the detection of matrine under a Ru(bpy)3~(2+)/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 x 10~(-6) M to 2.0 x 10~(-3) M. The lowest detection limit was 0.5 nM with a relative standard deviation of 5.47%. This constructed ECL sensor could be applicable for real sample analysis.