期刊
ANALYTICA CHIMICA ACTA
卷 731, 期 -, 页码 40-48出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2012.04.013
关键词
Molecularly imprinted polymer; Coating; Solid-phase microextraction; Reversible addition-fragmentation chain transfer polymerization
资金
- National Natural Science Foundation of China [20905026]
- Guangdong Provincial Natural Science Foundation of China [S2011010003500]
Surface reversible addition-fragmentation chain transfer (RAFT) polymerization method was firstly applied to the preparation of molecularly imprinted polymer (MIP) coated silicon solid-phase microextraction (SPME) fibers. With Sudan I as template, an ultra-thin MIP coating with about 0.55-mu m thickness was obtained with homogeneous structure and controlled composition, due to the controllable radical growing and chain propagation in surface RAFT polymerization. The MIP-coated fibers were found with enhanced selectivity coefficients (3.0-6.5) to Sudan I-IV dyes in contrast with those reported in our previous work. Furthermore, the ultra-thin thickness of MIP coating was helpful to the effective elution of template and fast adsorption/desorption kinetics, so only about 18 min was needed for MIP-coated SPME operation. The detection limits of 21-55 ng L-1 were achieved for four Sudan dyes, when MIP-coated SPME was coupled with liquid chromatography (LC) and mass spectrometry (MS) detection. The MIP-coated SPME-LC-MS/MS method was tested for the monitoring of ultra trace Sudan dyes in spiked chilli tomato sauce and chilli pepper samples, and high enrichment effect, remarkable matrix peaks-removing capability, and consequent high sensitivities were achieved to four Sudan dyes. (C) 2012 Elsevier B.V. All rights reserved.
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