期刊
TALANTA
卷 174, 期 -, 页码 725-732出版社
ELSEVIER
DOI: 10.1016/j.talanta.2017.07.002
关键词
Molecularly imprinted polymer; Reversible addition-fragmentation chain transfer polymerization; Superparamagnetic; 2,4-dichlorophenoxyacetic acid; Chinese cabbage
资金
- National Natural Science Foundation of China [21475140, 21675161, 21366024, 21665018]
- Ministry of Science and Technology of China [2015CB856303]
- Chinese Academy of Sciences
Superparamagnetic core-shell molecularly imprinted polymer nanoparticles (MIPs) were prepared via surface initiated reversible-addition fragmentation chain transfer (si-RAFT) polymerization for the selective recognition of 2,4-dichlorophenoxyacetic acid (2,4-D) in real samples. The construction of uniform core-shell structure with a 50 nm MIP layer was successfully accomplished, which favored mass transfer and resulted in fast recognition kinetics. The static equilibrium experiments revealed the satisfied adsorption capacity and imprinting efficiency of Fe3O4@MIP. Moreover, the Fe3O4@MIP exhibited high selectivity and affinity towards 2,4-D over structural analogues. The prepared Fe3O4@MIP nanoparticles were used for the selective enrichment of 2,4-D in tap water and Chinese cabbage samples. Combined with RP-HPLC, the recoveries of 2,4-D were calculated from 93.1% to 103.3% with RSD of 1.7-5.4% (n = 3) in Chinese cabbage samples. This work provides a versatile approach for fabricating well-constructed core-shell MIP nanoparticles for rapid enrichment and highly selective separation of target molecules in real samples.
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