基于Fe3O4@SiO2-MIPs富集/表面增强拉曼光谱检测孔雀石绿的研究

Determination of malachite green based on Fe3O4@SiO2-MIPs for selective extraction combined with highly senstive SERS determination

以乙烯基修饰的二氧化硅包覆磁性纳米材料为载体，孔雀石绿（MG）为模板分子，采用表面印迹技术制备了具有核壳结构的磁性分子印迹聚合物Fe3O4@SiO2-MIPs （MG）。运用透射电镜（TEM）、傅里叶变换红外光谱仪（FT-IR）、X射线衍射仪（XRD）等技术对聚合物进行结构表征，并开展吸附性能研究。实验结果表明，所制备的Fe3O4@SiO2-MIPs （MG）对MG具有优异的分子识别能力和良好的选择性吸附性能，实现了对养殖水和虾肉中MG的高效富集，采用纳米银表面增强拉曼光谱定量，检测限分别达到0．5 ng/mL和6 ng/g，具有广阔的应用推广前景。

A novel core-shell magnetic molecularly imprinted polymer was prepared by surface imprinting tech-nique, using malachite green （MG） as template, vinyl -functionlized silica -coated magnetic nanoparticles （Fe3O4@SiO2） as supporter. The polymers were characterized by transmission electron microscopy （TEM）, fourier-transform infrared spectra（FT-IR） and x-ray diffraction （XRD）. Adsorption studies demonstrated that the Fe3O4@SiO2-MIPs （MG） has excellent adsorption and selective recognition ability toward malachite green, and this technology was used for the analysis of malachite green in aquaculture water and aquatic products successfully. Base on silver nanoparticles the detection limits of SERS were 0.5 ng/mL and 6 ng/g for aquaculture water and shrimp, re-spectively. It is hopeful to be a new method in rapid and real-time detection.