期刊
JOURNAL OF SEPARATION SCIENCE
卷 44, 期 2, 页码 636-644出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.202000821
关键词
magnetic solid-phase extraction; milk; multi-class mycotoxins; multi-walled carbon nanotubes; polyethyleneimine
资金
- NationalNatural Science Foundation of China [21804138]
- FundamentalResearch Funds of the Institute of Quality Standards andTesting Technology for Agro-Products, ChineseAcademy ofAgricultural Sciences [1610072020005]
Polyethyleneimine-modified magnetic multi-walled carbon nanotubes were developed as an adsorbent for efficient extraction of mycotoxins, with high adsorption capacities and quick adsorption and desorption processes. The adsorbent, combined with liquid chromatography-tandem mass spectrometry, showed great potential in routine analysis of mycotoxins in laboratory settings.
Polyethyleneimine-modified magnetic multi-walled carbon nanotubes were developed to extract 10 mycotoxins. Simple modification of polyethyleneimine was achieved on the magnetic substrate by using an epoxy-containing silane agent as a linker. The resultant magnetic adsorbent was integrated with reverse phase and anion exchange interaction sites. Under optimal extraction conditions, only 20.0 mg adsorbent was used to extract the mycotoxins from 50.0 mL loading solution. The maximum adsorption capacities of the adsorbent toward the mycotoxins ranged from 4.9 to 10.2 mg/g. Adsorption and desorption were completed within 3.0 and 2.0 min, respectively. The adsorbent could be used for six repeated runs without evident change in extraction performance. The adsorbent combined with liquid chromatography-tandem mass spectrometry was applied further to analyze the mycotoxins in milk. The absolute recoveries of the 10 mycotoxins ranged from 88.3 to 103.5% with relative standard deviations that ranged from 2.4 to 6.5%, and their limits of detection were 0.003 to 0.442 mu g/kg. The proposed adsorbent has great potential in the routine analysis of mycotoxins in ordinary analytical chemistry laboratory.
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