ZHAI Ming-hui,LIU Shi-wei,WANG Ying,SU Li-qiang,HAN Shuang,SONG Yu-zhuo,HE Xi-feng.Preparation and Adsorption Properties of Hippuric Acid-Molecularly Imprinted Polymers Based on Flower-Like Mesoporous Silica[J].Journal of Instrumental Analysis,2025,44(11):2277-2284.
In this paper,using tetraethyl orthosilicate(TEOS) as raw material,hexadecyl trimethyl ammonium chloride(CTAC) as porosity agent,flower-like spherical mesoporous silica nanoparticles was prepared by a soft template method,and using hippuric acid(HA) as a template molecule,3-aminopropyltriethoxysilane(ATPES) as a functional monomer and TEOS as a cross-linking agent,a molecular imprinted polymers(FSMSNs@MIPs) of HA with specific recognition were prepared on the surface of FSMSNs. The FSMSNs@MIPs nanoparticles were characterized using Fourier transform infrared spectroscopy(FT-IR),transmission electron microscopy(TEM),dynamic light scattering(DLS) and X-ray photoelectron spectroscopy(XPS). The adsorption performance of the prepared FSMSNs@MIPs was investigated,and the adsorption mechanism was discussed with the adsorption models such as Langmuir model and quasi-second-order dynamics model. The results showed that FSMSNs@MIPs had high selectivity and good stability for HA,and the maximum adsorption capacity was 85.32 mg/g. The adsorption process belonged to surface single molecular layer chemisorption. FSMSNs@MIPs were used as solid-phase extraction(SPE) packing materials to prepare molecularly imprinted solid-phase extraction packed columns. The solid-phase extraction conditions were optimized for the adsorption separation and determination of HA in fresh milk by combining with high performance liquid chromatography(HPLC) with spiked recoveries ranging from 92.1%-99.3%,and RSD≤3.6%. The imprinted material showed good specific recognition ability to HA.
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