Kai Zhen-Peng, Hou Meng-Xia, Zhu Jing-Jing, Jiang Zhong-Ping, Chen Shan-Shan
School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
Shandong Province Key Laboratory of Chemical Pesticide, Shandong Academy of Pesticide Sciences, Jinan 250100, China.
Foods. 2023 Oct 11;12(20):3742. doi: 10.3390/foods12203742.
Graphitized carbon black (GCB) in the traditional QuEChERS (quick, easy, cheap, effective, rugged, and safe) method was used to remove the interfering substance chlorophyll in vegetable and fruit samples for pesticide residues determination. However, it not only adsorbs pigments, but also adsorbs some planar and aromatic pesticides. In order to solve the shortcoming, a core-shell magnetic molecularly imprinted polymer (FeO@MIP) that can specifically recognize and adsorb chlorophyll was synthesized, and an advanced QuEChERS method with the FeO@MIP as a purification material was developed. This advanced method presents detection that is highly sensitive, specific, and reproducible for planar and aromatic pesticides. The limits of detection (LOD) ranged from 0.001-0.002 mg kg, and the limit of quantification (LOQ) was 0.005 mg kg. The recovery for the planar and aromatic pesticides was within 70-110% with the associated relative standard deviations < 15% in leek samples by the advanced QuEChERS method. However, in the traditional QuEChERS method with GCB, the recovery of most planar and aromatic pesticides was <60%. It may also be useful for the determination of other pesticides in vegetable samples with quick and easy sample purification.
传统的QuEChERS（快速、简便、廉价、有效、耐用且安全）方法中使用石墨化炭黑（GCB）去除蔬菜和水果样品中的干扰物质叶绿素，以测定农药残留。然而，它不仅吸附色素，还吸附一些平面和芳香族农药。为了解决这一缺点，合成了一种能够特异性识别和吸附叶绿素的核壳磁性分子印迹聚合物（FeO@MIP），并开发了一种以FeO@MIP作为净化材料的先进QuEChERS方法。这种先进方法对平面和芳香族农药的检测具有高灵敏度、特异性和可重复性。检测限（LOD）范围为0.001 - 0.002 mg/kg，定量限（LOQ）为0.005 mg/kg。通过先进的QuEChERS方法，韭菜样品中平面和芳香族农药的回收率在70 - 110%之间，相关相对标准偏差<15%。然而，在使用GCB的传统QuEChERS方法中，大多数平面和芳香族农药的回收率<60%。它对于蔬菜样品中其他农药的测定以及快速简便的样品净化也可能有用。
