乙烯基功能化磁性分子印迹聚合物的制备和识别性能研究

In order to enhance the extraction and identification of polysaccharides in red pine bark extract, bifunctional monomers molecularly imprinted polymer microspheres (Fe₃O₄@SiO₂-C〖FY=,1〗C@MIPs) were prepared by using magnetic Fe₃O₄@SiO₂-C〖FY=,1〗C functional microspheres as the carrier, 4-vinyl phenylboric acid (VPBA) and acrylamide (AM) as functional monomer, N,N'-methylene double acrylamide (MBA) as crosslinking agent and ammonium persulfate (APS) as initiator for specific adsorption of starch polysaccharides. The properties of molecularly imprinted polymeric microspheres were determined by scanning electron microscopy, transmission electron microscopy and infrared spectroscopy. The results showed that APBA was successfully grafted on the surface, and the starch adsorption amount and the imprinting factor IF reached 12.48 mg/g and 3.029, respectively. The adsorption of MIPs was more consistent with the second-order kinetic model and Langmuir adsorption curve. The covalent bond binding of boric acid derivative (APBA) and polysaccharide molecule and the hydrogen bond binding of amides compound (AMPS) and polysaccharide molecule increased the adsorption amount and specificity of molecular imprinting. Fe₃O₄@SiO₂-C〖FY=,1〗C could specifically adsorb G10000 polysaccharide.