Department of Applied Chemistry, College of Science, China Agricultural University, Yuanmingyuan West Road 2#, Haidian District, Beijing 100193, China.
Institute of Applied Chemistry, Shanxi Datong University, No. 5 Xingyun Street, Datong 037009, China.
Food Chem. 2020 Jul 1;317:126425. doi: 10.1016/j.foodchem.2020.126425. Epub 2020 Feb 17.
Herein, we developed a novel magnetic solid phase extraction method based on attapulgite-modified magnetic metal-organic frameworks (ATP@FeO@ZIF-8), and this method could be used for the determination of benzoylureas when it was coupled with high-performance liquid chromatography. The established method was validated in terms of linearity (2.5-500 μg L, with correlation coefficient (R) > 0.9994), accuracy (with satisfactory recovery of 88.29-95.99%) and precision (with relative standard deviation (RSD) of less than 8%). In addition, the enrichment factors (EF) ranged from 63.6 to 72.2. Limit of detection (LOD) and limit of quantitation (LOQ) were 0.7-3.2 μg L and 2.3-10.7 μg L, respectively. Moreover, there was hardly any noticeable loss of the extraction efficiency when this extraction method undergoes five cycles. Finally, this method was successfully used for the determination of six benzoylureas in different tea infusions and the determined relative recoveries ranged from 78.8 to 114.3%.
在此，我们开发了一种基于埃洛石修饰的磁性金属有机骨架（ATP@FeO@ZIF-8）的新型磁性固相萃取方法，当与高效液相色谱法结合使用时，该方法可用于测定苯甲酰脲类农药。所建立的方法在线性范围（2.5-500μg L，相关系数（R）>0.9994）、准确度（回收率为 88.29-95.99%）和精密度（相对标准偏差（RSD）小于 8%）方面均得到了验证。此外，富集因子（EF）范围为 63.6-72.2。检测限（LOD）和定量限（LOQ）分别为 0.7-3.2μg L 和 2.3-10.7μg L。此外，当这种萃取方法经历五个循环时，萃取效率几乎没有明显损失。最后，该方法成功用于不同茶饮料中六种苯甲酰脲类农药的测定，测定的相对回收率在 78.8-114.3%之间。
