期刊
JOURNAL OF SEPARATION SCIENCE
卷 35, 期 2, 页码 308-314出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201100721
关键词
Molecularly imprinted polymer; Parabens; Solid-phase microextraction; Soy
资金
- Specialized Research Funds of Research on Key Techniques for Food Safety
- Key Research Program in Henan province of China [0422031200]
- Key Scientific and Technological Project of Henan Province [112102310030]
- Natural Science Basic Research Plan in the Education Department of Henan Province [2010A150006]
- Education Innovation Foundation for postgraduates of Henan University of Technology [10YJS036]
A prepared molecularly imprinted polymer with ethyl p-hydroxybenzoate as template molecule was applied for the first time to a homemade solid-phase microextraction fiber. The molecularly imprinted polymer-coated solid-phase microextraction fiber was characterized by scanning electron microscopy and thermogravimetric analysis. Various parameters were investigated, including extraction temperature, extraction time, and desorption time. Under the optimum extraction conditions, the molecularly imprinted polymer-coated solid-phase microextraction fiber exhibited higher selectivity with greater extraction capacity toward parabens compared with the nonimprinted polymer-coated solid-phase microextraction fiber and commercial fibers. The molecularly imprinted polymer-coated solid-phase microextraction fiber was tested using gas chromatography to determine parabens, including methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, and propyl p-hydroxybenzoate. The linear ranges were 0.01-10 mu g/mL with a correlation coefficient above 0.9943. The detection limits (under signal-to-noise ratio of 3) were below 0.30 mu g/L. The fiber was successfully applied to the simultaneous analysis of three parabens in spiked soy samples with satisfactory recoveries of 95.48, 97.86, and 92.17%, respectively. The relative standard deviations (n = 6) were within 2.83-3.91%. The proposed molecularly imprinted polymer-coated solid-phase microextraction method is suitable for selective extraction and determination of trace parabens in food samples.
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