期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 62, 期 46, 页码 11138-11145出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf504144g
关键词
superparamagnetism; water-compatible; magnetic molecularly imprinted polymers; vanillin; selective adsorption
资金
- National Natural Science Foundation of China [21201098, 51102131, 31160317, 21275158, 21105117]
- Jiangxi Department of Education Fund [GJJ13039]
- Specialized Research Fund for the Doctoral Program of Higher Education [20113601110004]
Novel water-compatible superparamagnetic molecularly imprinted polymers (M-MIPs) were prepared by coating superparamagnetic Fe3O4 nanoparticles with MIPs in a methanol-water reaction system. The M-MIPs were used for the selective adsorption and separation of vanillin from aqueous solution. The M-MIPs were characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), vibrating sample magnetometry (VSM), and scanning electron microscopy (SEM). Results indicated that a core shell structure of M-MIPs was obtained by coating a layer of silica and MIPs on the surface of the Fe3O4 nanoparticles. The obtained M-MIPs possess a loose and porous structure and can be rapidly separated from the solution using a magnet. The adsorption experiments showed that the binding capacity of the M-MIPs was significantly higher than that of the superparamagnetic non-molecularly imprinted polymers (M-NIPs). Meanwhile, the adsorption of M-MIP's reached equilibrium within 100 min, and the apparent maximum adsorption quantity (Q(max)) and dissociation constant (K-d) were 64.12 mu mol g(-1) and 58.82 mu mol L-1, respectively. The Scatchard analysis showed that homogeneous binding sites were formed on the M-MIP surface. The recoveries of 83.39-95.58% were achieved when M-MIPs were used for the pre-concentration and selective separation of vanillin in spiked food samples. These results provided the possibility for the separation and enrichment of vanillin from complicated food matrices by M-MIPs.
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