Fabrication of molecularly imprinted polypyrrole /Ru@ethyl-SiO 2 nanocomposite for the ultrasensitive electrochemiluminescence sensing of 17β-Estradiol

摘要

A solid-state electrochemiluminescence (ECL) sensor for the highly selective and sensitive detection of 17β-estradiol (E2) is presented. The sensor is constructed with Ru(bpy)32+doped vinyl-SiO2nanoparticles (Ru@ethyl-SiO2) and E2 imprinted polypyrrole (MIP). The Ru@ethyl-SiO2nanoparticles act as luminophores, while the MIP provides recognition sites for E2. As the adsorbed template molecules can act as co-reactant for Ru@ethyl-SiO2, the ECL intensity increases with the adsorption amount of E2 rising, which depends on its concentration in the solution. Owing to the well combination/or synergy of the smart MIP and the high-effective ECL material, the resulting sensor exhibits highly selective and ultrasensitive response to E2. Under the selected conditions, the ECL intensity increment (ΔI) is linear to the logarithm of E2 concentration over the range from 0.01 to 100?pg?mL?1, and the detection limit is down to 0.005?pg?mL?1(S/N?=?3). The ECL sensor also shows good reproducibility and repeatability. It has been successfully applied to the detection of E2 in tea and oral solution samples and the recoveries are 87.7%–115.3%.