期刊
FOOD ANALYTICAL METHODS
卷 12, 期 9, 页码 1938-1948出版社
SPRINGER
DOI: 10.1007/s12161-019-01539-y
关键词
Molecularly imprinted polymers; Mesoporous silica materials; Matrix solid-phase dispersion; Sulfonylurea herbicides; Grain; Liquid chromatography-tandem mass spectrometry
资金
- Heilongjiang natural science foundation [JJ2018ZR0081]
- Fundamental Research Funds for the Central Universities [2572017EB08]
A method for determination of sulfonylurea herbicides (SUHs) in grain was developed by using mesoporous structured molecularly imprinted polymers (M-MIPs) as adsorbents of matrix solid-phase dispersion (MSPD) extraction, coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS). In this method, M-MIPs were synthesized by selecting chlorimuron-ethyl as template molecule, cetyltrimethylammonium bromide as mesoporous structure directing agent, 3-aminopropyltriethoxysilane as functional monomer, and tetraethyl orthosilicate as crosslinker. Then, M-MIPs were characterized by diverse instrumental techniques, absorption characteristics of M-MIPs were studied, and the experimental conditions for the MSPD extraction were optimized. MSPD enabled extraction and clean-up steps to be completed simultaneously. The M-MIPs with mesoporous structure improved detection selectivity, increased adsorptive capacity, and accelerated adsorption rate. Under the best conditions, excellent linearity of SUHs was obtained in the range of 0.25-25 mu g kg(-1), the determination limits of chlorimuron-ethyl, nicosulfuron, thifensulfuron-methyl and chlorsulfuron were 0.075, 0.069, 0.083, and 0.105 mu g kg(-1), respectively. The relative standard deviations were less than 5.5%.
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