Magnetic MOF–ionic liquid composite hydrogel for rapid MSPE-HPLC-FLD determination of aflatoxins in corn

IF 5.8 Q2 CHEMISTRY, MULTIDISCIPLINARY

Results in Chemistry Pub Date : 2026-08-01 Epub Date: 2026-07-11 DOI:10.1016/j.rechem.2026.103633

Danna Liᵃ, Liqin Yuᵇ

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Abstract

A magnetic composite hydrogel was developed as a novel adsrobent for magnetic solid-phase extraction of aflatoxins in corn prior to high-performance liquid chromatography-fluorescence detection. The material integrates Fe₃O₄ magnetic nanoparticles, NH₂-UiO-66, imidazolium-based ionic liquid, and chitosan hydrogel, forming a multifunctional adsorbent with enhanced adsorption performance. Benefiting from the synergistic effects of π–π interactions, hydrogen bonding, electrostatic attraction, and hydrophobic interactions, the composite hydrogel exhibited excellent affinity toward aflatoxins. Under optimized conditions, rapid adsorption equilibrium was achieved within 3 min. The proposed method showed good linearity (R² > 0.9985), with limits of detection of 0.1–0.5 μg/kg. Spiked recovery experiments in corn samples yielded satisfactory recoveries ranging from 74% to 113% with relative standard deviations between 3.8% and 19.7 (n = 3). The developed method provides a simple, rapid, and reliable approach for trace determination of aflatoxins in complex cereal matrices.

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磁性mof -离子液体复合水凝胶快速MSPE-HPLC-FLD测定玉米中的黄曲霉毒素

制备了一种磁性复合水凝胶，用于玉米中黄曲霉毒素的磁固相萃取和高效液相色谱-荧光检测。该材料将Fe₃O₄磁性纳米颗粒、NH₂-UiO-66、咪唑基离子液体和壳聚糖水凝胶结合在一起，形成了一种具有增强吸附性能的多功能吸附剂。得益于π -π相互作用、氢键、静电吸引和疏水相互作用的协同作用，复合水凝胶对黄曲霉毒素具有良好的亲和力。在优化条件下，吸附在3 min内达到快速平衡。该方法线性良好（R2 > 0.9985），检出限为0.1 ~ 0.5 μg/kg。玉米样品加标回收率为74% ~ 113%，相对标准偏差为3.8% ~ 19.7 （n = 3）。该方法为复杂谷物基质中黄曲霉毒素的痕量测定提供了一种简便、快速、可靠的方法。

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