Molecular Imprinting in Fluorescent Particle Stabilized Pickering Emulsion for Selective and Sensitive Optosensing of λ-Cyhalothrin

Abstract

A red luminescent europium (Eu) complex covalently modified mesoporous silica spheres (mSiO 2 − Eu(TTA) 3 Bpc; TTA, 2-thenoyltrifluoroacetone; Bpc, 2,2′bipyridine-4,4′-dicarboxylic acid) were designed. Then the molecularly imprinted polymers combined with fluorescence sensor were first prepared via mSiO 2 −Eu(TTA) 3 Bpc stabilized Pickering emulsion polymerization, and were further applied for selective and sensitive optosensing of λ-cyhalothrin (LC). The as-prepared mSiO 2 −Eu(TTA) 3 Bpc@MIPs were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and elemental analyzer, the results demonstrated the formation of monodisperse and uniform-sized LCimprinted spheres. Meanwhile, fluorescence spectroscopy was used to evaluation of optical stability, effect of pH, and selective and sensitive determination of LC. The fluorescent intensity of mSiO 2 −Eu(TTA) 3 Bpc@MIPs decreased in the first 5 days and then kept stable for nearly a month. Under optical conditions, mSiO 2 −Eu(TTA) 3 Bpc@MIPs were successfully applied to selectively and sensitively detect LC in water, and a linear relationship could be obtained covering the concentration range of 10−1000 μM with a correlation coefficient of 0.9986. Moreover, LC could quench the luminescence of mSiO 2 −Eu(TTA) 3 Bpc@ MIPs in a concentration-dependent manner, which was best described by a Stern−Volmer-type equation.

Molecularly Imprinted Polymeric Micro- and Nano-Particles for the Targeted Delivery of Active Molecules

“…The effects of the solvent polarity on porosity were also reported in other studies [55][56][57][58][59][60]. Use of the Pickering radical polymerization scheme to increase the MI polymer porosity has also been reported [61][62][63][64][65][66][67]. Also polymers can be used as porogens [37,38].…”

Fluorescence Quenching of a Europium Coordination Compound for the Detection of Trace Amounts of Water: Uncovering the Response Mechanism by Structural Confirmation

“…The plot of ( F 0 / F – 1) against [H 2 O] shows a linear relationship at low water concentrations (Figure 12, b). The linear fit to the Stern–Volmer equation is well matched and has a correlation coefficient R of 0.998 32. The slope of the line is considered as the Stern–Volmer quenching constant K and is a measure of the sensitivity of the method.…”

Molecular imprinting in particle-stabilized emulsions: enlarging template size from small molecules to proteins and cells

“…Most of the work has focused on imprinting against low molecular weight compounds [22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Besides spherical MIP particles, more complex imprinted structures have also been produced, e.g.…”