Temperature-Responsive Covalent Organic Framework-Encapsulated Carbon Dot-Based Sensing Platform for Pyrethroid Detection via Fluorescence Response and Smartphone Readout,Journal of Agricultural and Food Chemistry

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Temperature-Responsive Covalent Organic Framework-Encapsulated Carbon Dot-Based Sensing Platform for Pyrethroid Detection via Fluorescence Response and Smartphone Readout
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2022-05-11 , DOI: 10.1021/acs.jafc.2c01568
Ying Zhang ₁ , Xuecheng Zhu ₁ , Mingjian Li ₁ , Huilin Liu ₁ , Baoguo Sun ₁

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In this paper, carbon dot (CD)-encapsulated 1,3,5-tris(4-formylphenyl)benzene (TFB)/2,5-dihydroxyterephthalohydrazide (DHTH) covalent organic frameworks (TDCOFs) grafted with thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) (CDs@TDCOFs@PNIPAM) were fabricated for the detection of pyrethroids. CDs@TDCOFs@PNIPAM achieved a temperature-responsive “on/off” detection of pyrethroids based on the target-triggered electron-transfer mechanism. The detection limit of pyrethroids was as low as 0.69 μg/L in the wide linear range of 5–400 μg/L (R² > 0.9523). Simultaneously, CDs@TDCOFs@PNIPAM with red, green, and blue (RGB) fluorescence emissions were integrated with a smartphone-assisted device, enabling the visual smart quantitative detection of pyrethroids with a detection limit of 4.875 μg/L. Ultimately, agricultural products were chosen as actual samples to verify the applicability of both recognition modes, and the calculated recovery rate was 105.48–113.40%. Accordingly, CDs@TDCOFs@PNIPAM featuring temperature-responsive switching behavior and RGB fluorescence emission provided a promising analytical strategy for ensuring agricultural and food safety.

中文翻译：

温度响应型共价有机框架封装碳点传感平台，用于通过荧光响应和智能手机读数进行拟除虫菊酯检测

本文采用碳点 (CD) 封装的 1,3,5-三(4-甲酰基苯基)苯 (TFB)/2,5-二羟基对苯二甲酰肼 (DHTH) 共价有机骨架 (TDCOFs) 接枝了热响应性聚 ( N-异丙基丙烯酰胺) ) (PNIPAM) (CDs@TDCOFs@PNIPAM) 用于检测拟除虫菊酯。CDs@TDCOFs@PNIPAM 基于目标触发的电子转移机制实现了对拟除虫菊酯的温度响应“开/关”检测。拟除虫菊酯的检出限在 5-400 μg/L 的宽线性范围内低至 0.69 μg/L ( R ²> 0.9523)。同时，具有红绿蓝（RGB）荧光发射的CDs@TDCOFs@PNIPAM与智能手机辅助设备集成，实现了拟除虫菊酯的视觉智能定量检测，检测限为4.875 μg/L。最终选择农产品作为实际样本，验证两种识别模式的适用性，计算得到的回收率为105.48-113.40%。因此，具有温度响应开关行为和 RGB 荧光发射的 CDs@TDCOFs@PNIPAM 为确保农业和食品安全提供了一种很有前景的分析策略。

更新日期：2022-05-11

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