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Reference type: Journal
Authors: Lu CH, Zhou WH, Han B, Yang HH, Chen X, Wang XR
Article Title: Surface-Imprinted Core-Shell Nanoparticles for Sorbent Assays.
Publication date: 2007
Journal: Analytical Chemistry
Volume: 79
Issue: (14)
Page numbers: 5457-5461.
DOI: 10.1021/ac070282m

Abstract: Abstract: In this paper, we present a general protocol for the making of surface-imprinted core-shell nanoparticles via surface reversible addition-fragmentation chain-transfer (RAFT) polymerization using RAFT agent functionalized model silica nanoparticles as the chain-transfer agent. In this protocol, trichloro(4-chloromethylphenyl)silane was immobilized on the surface of SiO2 nanoparticles, forming chloromethylphenyl functionalized silica (silica-Cl). RAFT agent functionalized silica was subsequently produced by substitute reaction of silica-Cl with PhC(S)SMgBr. The grafting copolymerization of 4-vinylpyridine and ethylene glycol dimethacrylate using surface RAFT polymerization and in the presence of 2,4-dichlorophenoxyacetic acid as the template led to the formation of surface-imprinted core-shell nanoparticles. The resulting surface-imprinted core-shell nanoparticles bind the original template 2,4-D with an appreciable selectivity over structurally related compounds. The potential use of the surface-imprinted core-shell nanoparticles as the recognition element in the competitive fluorescent binding assay for 2,4-D was also demonstrated
Template and target information: 2,4-dichlorophenoxyacetic acid, 2,4-D

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