期刊
出版社
ELSEVIER
DOI: 10.1016/j.jchromb.2019.121778
关键词
Aflatoxins; Magnetic solid phase extraction; Ionic liquid magnetic zeolitic imidazolate; framework; Milk
资金
- National Natural Science Foundation of China [51778390]
- Major Project of Natural Science Foundation of the Higher Education Institutions of Jiangsu Province [15KJA610003]
- Natural Science Foundation of Jiangsu Province [BK20160359]
The ionic liquid (IL) was introduced to the synthesis system of magnetic zeolite imidazolate framework-8 (M/ZIF-8), which was benefit to the formation of binary imidazole and the co-modification of M/ZIF-8. The morphology and textural properties of ILM/ZIF-8 were characterized by SEM, TEM, BET and BJH. The crystal structural shape and size of MZIF-8 was unvaried with the interventional of IL. The ILM/ZIF-8 was applied to the concentration and determination of aflaoxins (AFB(1), AFB(2), AFG(1), and AFG(2)) in milk samples based on magnetic solid phase extraction (MSPE) coupled with ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). The experimental parameters of the MSPE, including amount of ILM/ZIF-8, pH, type and amount of desorption solvent, extraction time and sample volume were investigated by a univariate method and orthogonal screening. The four AFs were concentrated from the 20 mL milk when 90 mg ILM/ZIF-8 was used as magnetic adsorbent. The extraction efficiency of Ms was higher than 80.0% within 15 min. The limits of quantitative and detection were 7.5-26.7 and 2.3-8.1 ng/L, respectively. The proposed method was applied to the determination of milk samples containing trace amounts of Ms and the recoveries ranged from 79.0% to 102.5%, with RSD below 7.7%.
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