Journal
RSC ADVANCES
Volume 2, Issue 13, Pages 5571-5579Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra20282d
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Funding
- National Natural Science Foundation of China [21077046, 21107037, 21176107, 21174057]
- Ph. D. Programs Foundation of Ministry of Education of China [20093227110015]
- Natural Science Foundation of Jiangsu Province [BK2011461, SBK2011459, BK2011514]
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This paper reports a molecularly imprinted polymers (MIPs) based fluorescence sensor which is synthesized by grafting MIP layers on the surface of ZnO nanorods embedded gamma-Fe2O3 nanoparticles via activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP). Methacrylic acid (MAA, functional monomer), 3-(trimethoxysilyl) propyl mathacrylate (MPS) modified gamma-Fe2O3 (gamma-Fe2O3/MPS, assistant magnetic monomer) and ethylene glycol dimethacrylate (EGDMA, cross-linking monomer) were co-polymerized in anisole at 313 K in the presence of sulfamethazine as a template molecule. Sulfamethazine was then solvent-extracted to obtain ZnO-grafted molecularly imprinted polymers (ZnO-MIPs). ZnO-MIPs were characterized by FE-SEM, TEM, FT-IR, TGA/DSC, VSM, fluorescence spectroscopy and Raman spectroscopy. It was observed that sulfamethazine can quench the luminescence of ZnO-MIPs in a concentration-dependent manner that can be described by a Stern-Volmer-type equation. ZnO-MIPs were used to determine sulfamethazine in a spiked pork sample with good recognition ability. This study therefore demonstrates the potential application in the recognition and separation of antibiotics based on molecularly imprinted polymers.
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