Selective Adsorption of Quercetin by the Sol-Gel Surface Molecularly Imprinted Polymer

作者：Keke Zhi, Zhe Li, Han Luo, Yitong Ding, Feiyan Chen, Yongxiang Tan, Hongrui Liu · 发表于：Polymers · 年份：2023 · DOI：10.3390/polym15040905 · 被引用次数：40 · 研究领域：Analytical chemistry methods development、Analytical Chemistry and Chromatography、Mesoporous Materials and Catalysis

Quercetin, as one of the most biologically active natural flavonoids, is widely found in various vegetables, fruits and Chinese herbs. In this work, molecularly imprinted polymer (MIP) was synthesized through surface molecular imprinting technology with sol-gel polymerization mechanism on SiO2 at room temperature using quercetin as the template, SiO2 as the supporter, 3-aminopropyltriethoxysilane (APTES) as the functional monomer, and tetraethoxysilane (TEOS) as the cross-linker. The prepared MIP was characterized via scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR) and nitrogen adsorption measurements to validate its surface morphology, structure and functionality. SEM images revealed that the morphology of MIP was rough and spherical with the particle size of 260 nm larger than that of the support SiO2. In the FTIR spectra of MIP, the band around 1499 cm−1 and 2932 cm−1 were assigned to N−H and C-H groups, respectively. The results indicated that the imprinted polymer layers were grafted on the surface of SiO2 and the MIP had been successfully prepared. Since the specific surface area and pore volume of MIP were markedly higher than those of NIP and SiO2 and were 52.10 m2 g−1 and 0.150 cm3 g−1, respectively, it was evident that the imprinting process created corresponding imprinted cavities and porosity. The MIP for adsorbing quercetin was evaluated by static adsorption experiment. The results indicated that the adsorption equilibrium coul...