Abstract
The high specific surface area of metal-organic framework (MOF) materials endows them with efficient adsorption capabilities, thereby facilitating sample purification. In this study, a novel aluminum-based MOF (Al-MOF) was synthesized and employed as a solid-phase extraction (SPE) adsorbent for the purification of aflatoxins B1 (AFB1), AFB2, AFG1, and AFG2 in vegetable oils. It was revealed that Al-MOF adsorbs aflatoxins through hydrogen bonding and π-π interactions. Under optimal SPE conditions, liquid chromatography-tandem mass spectrometry analysis yielded limits of detection ranging from 0.06 to 0.25μg/kg and limits of quantification from 0.21 to 0.84μg/kg for the four aflatoxins. Recovery rates at concentrations of 5, 10, and 20μg/kg ranged from 74% to 110%, with coefficients of variation below 11%. This method achieves efficient and cost-effective purification of aflatoxins in vegetable oils. Compared to national standard methods, this approach offers advantages such as lower material costs, ease of storage, and reusability.
Published Version
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