title: Hydrophilic gallic acid-imprinted polymers over magnetic mesoporous silica microspheres with excellent molecular recognition ability in aqueous fruit juices.
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 (Fe3O4@SiO2@mSiO2, MMS) using GA as template. Resulting Fe3O4@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.
authors.affiliation: College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Hu
authors.affiliation: College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; College of Sciences, Central South University of Forestry and Technology, Changsha 410004, China.
authors.forename: Lianwu
authors.initials: L
authors.lastname: Xie
authors.affiliation: College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
authors.forename: Junfang
authors.initials: J
authors.lastname: Guo
authors.affiliation: College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
authors.forename: Xinyu
authors.initials: X
authors.lastname: Jiang
authors.affiliation: College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
authors.forename: Yuping
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China. Electronic address: shuyshi@gmail.com.
authors.forename: Shuyun
authors.initials: S
authors.lastname: Shi
mesh_terms: D000327:Adsorption; D001628:Beverages / Q000032:analysis*; D005638:Fruit / Q000737:chemistry*; D005707:Gallic Acid / Q000032:analysis* / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D008863:Microspheres; D054802:Molecular Imprinting; D011108:Polymers / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D011108:Polymers; D005707:Gallic Acid; D012822:Silicon Dioxide
keywords: Fruit juice; Gallic acid; Hydrophilic molecularly imprinted polymer; Polydopamine; Selective extraction