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Reference type: Journal
Authors: Li H, Hu X, Zhang YP, Shi SY, Jiang XY, Chen XQ
Article Title: High-capacity magnetic hollow porous molecularly imprinted polymers for specific extraction of protocatechuic acid.
Publication date: 2015
Journal: Journal of Chromatography A
Volume: 1404
Page numbers: 21-27.
DOI: 10.1016/j.chroma.2015.05.038
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0021967315007311

Abstract: Magnetic hollow porous molecularly imprinted polymers (HPMIPs) with high binding capacity, fast mass transfer, and easy magnetic separation have been fabricated for the first time. In this method, HPMIPs was firstly synthesized using protocatechuic acid (PCA) as template, 4-vinylpyridine (4-VP) as functional monomer, glycidilmethacrylate (GMA) as co-monomer, and MCM-48 as sacrificial support. After that, epoxide ring of GMA was opened for chemisorbing Fe3O4 nanoparticles to prepare magnetic HPMIPs. The results of characterization indicated that magnetic HPMIPs exhibited large surface area (548 m2/g) with hollow porous structure and magnetic sensitivity (magnetic saturation at 2.9 emu/g). The following adsorption characteristics investigation exhibited surprisingly higher adsorption capacity (37.7 mg/g), and faster kinetic binding (25 min) than any previously reported PCA imprinted MIPs by traditional or surface imprinting technology. The equilibrium data fitted well to Langmuir equation and the adsorption process could be described by pseudo-second order model. The selective recognition experiments also demonstrated the high selectivity of magnetic HPMIPs towards PCA over analogues. The results of the real sample analysis confirmed the superiority of the proposed magnetic HPMIPs for selective and efficient enrichment of trace PCA from complex matrices
Template and target information: protocatechuic acid, PCA
Author keywords: Molecularly imprinted polymers, Hollow porous structure, magnetic separation, protocatechuic acid, Complex matrices

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