Self-assembly of a surface bisphenol A-imprinted core–shell nanoring amino-functionalized superparamagnetic polymer

Zhao, Yanfang; Chen, Xiaohong; Pan, Shinhwan; Zhu, Hao; Shen, Hao-Yu; Jin, Micong

doi:10.1039/c3ta12488f

Cited by 40 publications

(13 citation statements)

References 45 publications

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“…The absence of hysteresis (graphics are perfectly symmetrical) and coercivity (the middle point of the graphics is zero) revealed that all studied materials (from magnetite to Mag-MIP) depicted supermagnetic behavior (Zhao et al, 2013 (Zhao et al 2013). The saturation (magnetic) value of Fe 3 O 4 @MIP was decreased by over 100-fold compared with the pure Fe 3 O 4 , which is perfectly expected, since in each step of the modification, the super-paramagnetic magnetite was surrounded by layers of non-magnetic materials, allowing the magnetism of the material decrease successively.…”

Section: Measurements Of Vibrating Sample Magnetometry (Vsm)mentioning

confidence: 95%

Magnetically separable polymer (Mag-MIP) for selective analysis of biotin in food samples

et al. 2016

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This work presents an efficient method for the preparation of magnetic nanoparticles modified with molecularly imprinted polymers (Mag-MIP) through core-shell method for the determination of biotin in milk food samples. The functional monomer acrylic acid was selected from molecular modeling, EGDMA was used as cross-linking monomer and AIBN as radical initiator. The Mag-MIP and Mag-NIP were characterized by FTIR, magnetic hysteresis, XRD, SEM and N2-sorption measurements. The capacity of Mag-MIP for biotin adsorption, its kinetics and selectivity were studied in detail. The adsorption data was well described by Freundlich isotherm model with adsorption equilibrium constant (KF) of 1.46 mL g(-1). The selectivity experiments revealed that prepared Mag-MIP had higher selectivity toward biotin compared to other molecules with different chemical structure. The material was successfully applied for the determination of biotin in diverse milk samples using HPLC for quantification of the analyte, obtaining the mean value of 87.4% recovery.

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Section: Measurements Of Vibrating Sample Magnetometry (Vsm)mentioning

confidence: 95%

Magnetically separable polymer (Mag-MIP) for selective analysis of biotin in food samples

et al. 2016

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“…The adsorption quantity ( Q , mg/g) of l‐ cysteine‐Ag@SiO 2 for BPA was calculated according to Eq. :

Q = (C_{0} - C_{e}) V / m

where C 0 (mmol/L), C e (mmol/L), m (mg), and V (mL) are the initial and equilibrium concentration of BPA, the mass of l‐ cysteine‐Ag@SiO 2 , and the volume of solution, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The kinetic analysis was discussed using the Lagergren's pseudo‐second‐order models (Eq. ) :

t / q_{t} = 1 / k_{2} {q_{e}}^{2} + t / q_{e}

where q t and q e are the amount at t (min) and equilibrium amount (mmol/g), respectively. k 2 (g mmol −1 min −1 ) is the second‐order rate constant.…”

Section: Methodsmentioning

confidence: 99%

l‐Cysteine‐modified silver‐functionalized silica‐based material as an efficient solid‐phase extraction adsorbent for the determination of bisphenol A

Zhu

Li³

et al. 2017

J of Separation Science

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A new silver-functionalized silica-based material with a core-shell structure based on silver nanoparticle-coated silica spheres was synthesized, and silver nanoparticles were modified using strongly bound l-cysteine. l-Cysteine-silver@silica was characterized by scanning electron microscopy and FTIR spectroscopy. Then, a solid-phase extraction method based on l-cysteine-silver@silica was developed and successfully used for bisphenol A determination prior to HPLC analysis. The results showed that the l-cysteine-silver@silica as an adsorbent exhibited good enrichment capability for bisphenol A, and the maximum adsorption saturation was 20.93 mg/g. Moreover, a short adsorption equilibrium time was obtained due to the presence of silver nanoparticles on the surface of the silica. The extraction efficiencies were then optimized by varying the eluents and pH. Under the optimized conditions, good linearity for bisphenol A was obtained in the range from 0.4 to 4.0 μM (R > 0.99) with a low limit of detection (1.15 ng/mL). The spiked recoveries from tap water and milk samples were satisfactory (85-102%) with relative standard deviations below 5.2% (n = 3), which indicated that the method was suitable for the analysis of bisphenol A in complex samples.

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“…Moreover, Fe3O4 nanoparticles can be easily separated from the medium by an external magnetic field [18]. To protect Fe3O4 nanoparticles from be oxidized or dissolved under low pH conditions, Fe3O4 nanoparticles are coated with silica shell, which will own reliable chemical stability, biocompatibility and versatility in surface modification.…”

Section: Introductionmentioning

confidence: 99%

Preparation of core-shell magnetic molecular imprinted polymer with binary monomer for the fast and selective extraction of bisphenol A from milk

Yuan

Liu

Teng

et al. 2016

Journal of Chromatography A

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Self-assembly of a surface bisphenol A-imprinted core–shell nanoring amino-functionalized superparamagnetic polymer

Cited by 40 publications

References 45 publications

Magnetically separable polymer (Mag-MIP) for selective analysis of biotin in food samples

Magnetically separable polymer (Mag-MIP) for selective analysis of biotin in food samples

l‐Cysteine‐modified silver‐functionalized silica‐based material as an efficient solid‐phase extraction adsorbent for the determination of bisphenol A

Preparation of core-shell magnetic molecular imprinted polymer with binary monomer for the fast and selective extraction of bisphenol A from milk

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