Molecularly imprinted polymer coated solid-phase microextraction fiber prepared by surface reversible addition-fragmentation chain transfer polymerization for monitoring of Sudan dyes in chilli tomato sauce and chilli pepper samples

被引:74
作者
Hu, Xiaogang [1 ]
Fan, Yanan [1 ]
Zhang, Yi [2 ]
Dai, Guimei [1 ]
Cai, Quanling [1 ]
Cao, Yujuan [1 ]
Guo, Changjuan [1 ]
机构
[1] S China Normal Univ, Sch Chem & Environm, Guangzhou 510631, Guangdong, Peoples R China
[2] Shenzhen Entry Exit Inspect & Quarantine Bur Chin, Food Inspect & Quarantine Technol Ctr, Shenzhen 518045, Peoples R China
基金
中国国家自然科学基金;
关键词
Molecularly imprinted polymer; Coating; Solid-phase microextraction; Reversible addition-fragmentation chain transfer polymerization; FREE-RADICAL POLYMERIZATION; PERFORMANCE LIQUID-CHROMATOGRAPHY; TANDEM MASS-SPECTROMETRY; RAFT POLYMERIZATION; EXTRACTION; COPOLYMERS; FILMS; BLOCK; IV;
D O I
10.1016/j.aca.2012.04.013
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
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.
引用
收藏
页码:40 / 48
页数:9
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