Hydrophilic gallic acid–imprinted polymers over magnetic mesoporous silica microspheres with excellent molecular recognition ability in aqueous fruit juices. (15th July 2015)

• Record Type: Journal Article
• Authors: Hu, Xin; Xie, Lianwu; Guo, Junfang; Li, Hui; Jiang, Xinyu; Zhang, Yuping; Shi, Shuyun
• Is Part Of: Food chemistry. Volume 179(2015)
• Page Start: 206
• Page End: 212
• Publication Date: 2015-07-15
• Subjects: Polydopamine -- Hydrophilic molecularly imprinted polymer -- Selective extraction -- Gallic acid -- Fruit juice; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2015.02.007
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Hydrophilic Fe3 O4 @SiO2 @mSiO2 @MIPs with excellent recognition ability. The composites combined the advantages of Fe3 O4, mSiO2, PDA and MIPs. Fast, efficient and selective extraction of GA from fruit juice. Abstract: Hydrophilic molecularly imprinted polymers (MIPs) for gallic acid (GA) were prepared with excellent recognition ability in an aqueous solution. The proposed MIPs were designed by self-polymerization of dopamine (DA) on magnetic mesoporous silica (Fe3 O4 @SiO2 @mSiO2, MMS) using GA as template. Resulting Fe3 O4 @SiO2 @mSiO2 @MIPs (MMS–MIPs) were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), thermo-gravimetric analysis (TGA), Brunauer–Emmett–Teller (BET), vibrating sample magnetometer (VSM), and evaluated by adsorption isotherms/kinetics and competitive adsorption. The adsorption behavior between GA and MMS–MIPs followed Langmuir and Sips adsorption isotherms with a maximum adsorption capacity at 88.7 mg/g and pseudo-second-order reaction kinetics with fast binding (equilibrium time at 100 min). In addition, MMS–MIPs showed rapid magnetic separation (10 s) and stability (retained 95.2% after six cycles). Subsequently, MMS–MIPs were applied for the selective extraction and determination of GA from grape, apple, peach and orange juices (4.02, 3.91, 5.97, and 0.67 μg/g, respectively). Generally, the described method may pave the way towards rationally designing more advanced hydrophilic MIPs.