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Abstract: 3-Methacryloxypropyltrimethoxy silane modified Fe3O4 was employed as the carrier material to prepare core-shell magnetic molecularly imprinted polymers(Fe3O4@SiO2-MIPS) by using a surface molecular imprinting technology with propyl gallate as the template. The magnetic composites were loaded into a microchip and coupled with high-performance liquid chromatography to separate and preconcentrate synthetic phenolic antioxidants(SPAs). The structures of the resulting complex were characterized by scanning electron microscopy, vibrating sample magnetoeter, thermogravimetric analysis/differential thermal gravity analysis, Fourier-transformed infrared spectroscopy and X-ray diffraction spectrometry. Under the optimal conditions(3 mL of sample solution, sample pH of 5.0, sample flow rate of 0.5 mL/min, and eluent flow rate of 0.3 mL/min), the magnetic MIPS displayed enhanced adsorption ability for phenolic antioxidants. The calibration curves showed good linearity with correlation coefficients greater than 0.9901. Intra-day and inter-day relative standard deviations(RSD) were less than 2.8% and 3.5%, respectively. The present method was applied to the determination of phenolic antioxidants in cosmetics samples, illustrating satisfactory recovery(87.9%-104.0%) and reproducibility(RSD less than 3.7%).
Template and target information: propyl gallate
Author keywords: Microchip, molecularly imprinted, magnetic nanoparticles, Phenolic antioxidants