Abstract In this study, a magnetic nanocomposite was synthesized using a simple and efficient method, and its performance was evaluated through magnetic dispersive solid-phase extraction (MDSPE) of aflatoxins (AFs) in rice samples. The aqueous extract of Centaurea cyanus was used as a stabilizer and reducing agent in the synthesis of Fe3O4/zeolite nanocomposite. Field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FT-IR), zeta potential, Brunauer–Emmett–Teller (BET), and vibrating sample magnetometer (VSM) were used to characterize the morphology of the adsorbent. The effects of nanocomposite dosage, vortex time, ionic strength, sample volume, and desorption conditions on the extraction efficiency of AFs were studied. The proposed nanocomposite showed excellent binding properties to AFs in the range of 2–10 ng g−1, and 82–96% of AFs were extracted within the first minute of contact. The limits of detection (LODs) were 0.1 and 0.02 ng g−1 for AFB1-AFG1 and AFB2-AFG2, respectively. Moreover, the limits of quantification (LOQs), were 0.4 and 0.08 ng g−1 for AFB1-AFG1 and AFB2-AFG2, respectively. Compared to other methods for the extraction and determination of AFs, the suggested MDSPE-LC/FD method possessed advantages such as rapidity, simplicity, excellent figures of merit, and eco-friendly nature.

中文翻译：

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Fe3O4/沸石纳米复合吸附剂快速灵敏提取大米样品中的黄曲霉毒素

摘要 本研究采用简单高效的方法合成了一种磁性纳米复合材料，并通过磁分散固相萃取 (MDSPE) 对大米样品中的黄曲霉毒素 (AFs) 进行了评估。Centaurea cyanus的水提物在Fe3O4/沸石纳米复合材料的合成中用作稳定剂和还原剂。场发射扫描电子显微镜 (FE-SEM)、X 射线衍射 (XRD)、能量色散 X 射线光谱 (EDX)、傅里叶变换红外光谱 (FT-IR)、zeta 电位、Brunauer-Emmett-Teller ( BET) 和振动样品磁强计 (VSM) 用于表征吸附剂的形态。研究了纳米复合材料用量、涡旋时间、离子强度、样品体积和解吸条件对AFs提取效率的影响。所提出的纳米复合材料在 2-10 ng g-1 范围内对 AF 显示出优异的结合特性，并且在接触的第一分钟内提取了 82-96% 的 AF。AFB1-AFG1 和 AFB2-AFG2 的检测限 (LOD) 分别为 0.1 和 0.02 ng g-1。此外，AFB1-AFG1 和 AFB2-AFG2 的定量限 (LOQ) 分别为 0.4 和 0.08 ng g-1。与其他提取和测定 AFs 的方法相比，建议的 MDSPE-LC/FD 方法具有快速、简单、优异的品质因数和环境友好等优点。AFB1-AFG1 和 AFB2-AFG2 的定量限 (LOQ) 分别为 0.4 和 0.08 ng g-1。与其他提取和测定 AFs 的方法相比，建议的 MDSPE-LC/FD 方法具有快速、简单、优异的品质因数和环境友好等优点。AFB1-AFG1 和 AFB2-AFG2 的定量限 (LOQ) 分别为 0.4 和 0.08 ng g-1。与其他提取和测定 AFs 的方法相比，建议的 MDSPE-LC/FD 方法具有快速、简单、优异的品质因数和环境友好等优点。