Journal
ANALYTICAL CHEMISTRY
Volume 91, Issue 4, Pages 3027-3034Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.8b05344
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Funding
- National Natural Science Foundation of China [81603074, 81673398]
- China Postdoctoral Science Foundation [2017M623199]
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A novel method was developed for determination of aflatoxin B1, B2, G1, and G2 (AFB1, AFB2, AFG1, and AFG2) in wheat using inkjet-based dispersive liquid-liquid microextraction (DLLME) coupled with ultrahigh-pressure liquid chromatography-tandem mass spectrometry. A drop-on-demand jetting device was used to form a cloudy solution in traditional DLLME by injecting extraction solvent (10 mu L) as ultrafine droplets (similar to 20 mu m diameter) at high frequency into sample solution. The method was validated using wheat as a representative matrix, which was pretreated with acetonitrile/water solution. Good linearity was observed over the studied range (0.06-6 mu g/kg), and the limits of quantification (0.06-0.18 mu g/kg) were below the maximum level established by the European Union for cereal. Satisfactory recoveries, ranging from 83.2% to 93.0% with relative standard deviations below 4.6%, were obtained for all compounds. The method, which is convenient and reliable and has low solvent consumption, represents a new direction for the development of traditional DLLME technology.
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