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Reference type: Journal
Authors: Xie LW, Guo JF, Zhang YP, Hu YC, You QP, Shi SY
Article Title: Novel molecular imprinted polymers over magnetic mesoporous silica microspheres for selective and efficient determination of protocatechuic acid in Syzygium aromaticum.
Publication date: 2015
Journal: Food Chemistry
Volume: 178
Page numbers: 18-25.
DOI: 10.1016/j.foodchem.2015.01.069
Alternative URL: https://www.researchgate.net/publication/271448442_Novel_molecular_imprinted_polymers_over_magnetic_mesoporous_silica_microspheres_for_selective_and_efficient_determination_of_protocatechuic_acid_in_Syzygium_aromaticum

Abstract: Improving sites accessibility can increase the binding efficiency of molecular imprinted polymers (MIPs). In this work, we firstly synthesized MIPs over magnetic mesoporous silica microspheres (Fe3O4@mSiO2@MIPs) for the selective recognition of protocatechuic acid (PCA). The resulting Fe3O4@mSiO2@MIPs were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectrometer (FT-IR), thermo-gravimetric analysis (TGA), Brunauer-Emmett-Teller (BET), and vibration sample magnetometer (VSM), and evaluated by adsorption isotherms/kinetics and competitive adsorption. The maximum adsorption capacity of PCA on Fe3O4@mSiO2@MIPs was 17.2 mg/g (2.3 times that on Fe3O4@SiO2@MIPs). In addition, Fe3O4@mSiO2@MIPs showed a short equilibrium time (140 min), rapid magnetic separation (5 s) and high stability (retained 94.4% after six cycles). Subsequently, Fe3O4@mSiO2@MIPs were successfully applied for the selective and efficient determination of PCA (29.3 μg/g) from Syzygium aromaticum. Conclusively, we combined three advantages into Fe3O4@mSiO2@MIPs, namely, Fe3O4 core for quick separation, mSiO2 layer for enough accessible sites, and surface imprinting MIPs for fast binding and excellent selectivity, to extract PCA from complex systems
Template and target information: protocatechuic acid, PCA
Author keywords: Molecularly imprinted polymers, mesoporous silica, magnetic microsphere, protocatechuic acid, Syzygium aromaticum

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