Li Shuofeng, Liu Weihua, Wang Qianqian, Xu Mingming, An Yangjuan, Hao Lin, Wang Chun, Wu Qiuhua, Wang Zhi
College of Food Science and Technology, Hebei Agricultural University, Baoding 071001, China; College of Science, Hebei Agricultural University, Baoding 071001, China.
College of Science, Hebei Agricultural University, Baoding 071001, China.
Food Chem. 2022 Jul 15;382:132362. doi: 10.1016/j.foodchem.2022.132362. Epub 2022 Feb 7.
A magnetic covalent organic framework (COF) was constructed with ethidium bromide (EB) and 1,3,5-triformylphloroglucinol as building blocks. The prepared magnetic COF (named as EB-COF@FeO) exhibited high adsorption ability for five benzoylurea insecticides (BUs). By combining EB-COF@FeO based magnetic solid-phase extraction with high performance liquid-phase chromatographic detection, a novel method was developed for determination of five BUs in water and food samples. Under the optimized conditions, a good linearity was obtained to be 0.03-100.0 ng mL for water and juice, 0.9-500 ng g for tomato. The detection limits of the method were 0.01-0.09 ng mL, 0.03-0.3 ng mL and 0.3-2.0 ng g for water, juice and tomato samples, respectively. Satisfactory method recoveries were achieved in the range of 80.0%-116.0% with the intra-day and inter-day relative standard deviations below 10%. Moreover, the EB-COF@FeO can be reused at least 25 times. Therefore, the established method is sensitive and robust for determining BUs in real samples.
以溴化乙锭（EB）和1,3,5-三羟基苯甲醛为构筑单元构建了一种磁性共价有机框架（COF）。制备的磁性COF（命名为EB-COF@FeO）对五种苯甲酰脲类杀虫剂（BUs）表现出高吸附能力。通过将基于EB-COF@FeO的磁性固相萃取与高效液相色谱检测相结合，开发了一种测定水和食品样品中五种BUs的新方法。在优化条件下，水和果汁的线性范围为0.03 - 100.0 ng mL，番茄为0.9 - 500 ng g。该方法对水、果汁和番茄样品的检测限分别为0.01 - 0.09 ng mL、0.03 - 0.3 ng mL和0.3 - 2.0 ng g。方法回收率在80.0% - 116.0%范围内，日内和日间相对标准偏差低于10%，令人满意。此外，EB-COF@FeO至少可重复使用25次。因此，所建立的方法对实际样品中BUs的测定灵敏且可靠。
