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Fluorescent Detection of 2,4-Dichlorophenoxyacetic Acid in Food Samples Based on Covalent Organic Frameworks and MnO 2 Nanosheets
Food Analytical Methods ( IF 2.9 ) Pub Date : 2020-06-30 , DOI: 10.1007/s12161-020-01807-2
Fei Qu , Yang Sun , Shuxian Guo , Hang Yan , Jinmao You

2,4-Dichlorophenoxyacetic acid (2,4-D) is a typical chlorinated aromatic herbicide which is widely used because of its low cost. Herein, a new fluorescent assay for 2,4-D is developed based on covalent organic frameworks (COFs) and MnO2 nanosheets. The fluorescence of COFs is quenched effectively by MnO2 nanosheets. Ascorbic acid 2-phosphate (AAP) is hydrolyzed by alkaline phosphatase (ALP) to produce ascorbic acid (AA), which reduces MnO2 nanosheets into Mn2+, so the quenched fluorescence recovers. Additionally, 2,4-D can inhibit the catalytic activity of ALP. Therefore, the addition of 2,4-D quenches the fluorescence of COF-MnO2 system again. Under the optimum conditions, this assay displays a wide linear range of 2,4-D from 1 to 150,000 ng/mL with a limit of detection of 0.36 ng/mL. Then, this method is successfully used to measure 2,4-D in rice, millet, and cucumber samples with satisfactory recoveries. Compared with other probes for 2,4-D detection, both of COFs and MnO2 nanosheets are stable, cost-effective, and easily prepared. The sensitivity and linear range of 2,4-D in this strategy are superior to most reported works. This is the first time that a novel sensing platform using fluorescent COFs and MnO2 nanosheets is developed for 2,4-D.



中文翻译:

基于共价有机骨架和MnO 2纳米片的食品样品中2,4-二氯苯氧基乙酸的荧光检测

2,4-二氯苯氧基乙酸(2,4-D)是一种典型的氯化芳族除草剂,由于其低成本而被广泛使用。本文中,基于共价有机框架(COF)和MnO 2纳米片,开发了一种新的2,4-D荧光检测方法。MnO 2纳米片可有效淬灭COFs的荧光。碱性磷酸酶(ALP)将抗坏血酸2-磷酸酯(AAP)水解生成抗坏血酸(AA),从而将MnO 2纳米片还原为Mn 2+,从而恢复了猝灭的荧光。另外,2,4-D可以抑制ALP的催化活性。因此,添加2,4-D淬灭了COF-MnO 2的荧光系统再次。在最佳条件下,该测定法显示2,4-D的线性范围从1到150,000 ng / mL,检出限为0.36 ng / mL。然后,该方法成功地用于测定大米,小米和黄瓜样品中的2,4-D,回收率令人满意。与其他用于2,4-D检测的探针相比,COF和MnO 2纳米片均稳定,经济高效且易于制备。该策略中2,4-D的灵敏度和线性范围优于大多数报道的作品。这是首次为2,4-D开发使用荧光COF和MnO 2纳米片的新型传感平台。

更新日期:2020-06-30
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