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Determination of ethephon residues in fruits using fluorescent covalent organic framework-based nanomaterials

文献类型： 外文期刊

作者： Zhang, Zhikun 1 ; Xin, Bo 2 ; Bai, Liwei 1 ; Liu, Qingju 3 ;

作者机构： 1.Hebei Univ Sci & Technol, Sch Chem & Pharmaceut Engn, Shijiazhuang 050018, Peoples R China

2.Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Peoples R China

3.Beijing Acad Agr & Forestry Sci, Inst Qual Stand & Testing Technol, Beijing 10097, Peoples R China

关键词： Covalent organic framework; Detection; Ethephon; Fluorescent probe; Fruit; Protonation

期刊名称：JOURNAL OF FOOD COMPOSITION AND ANALYSIS （ 影响因子：4.6； 五年影响因子：4.6 ）

ISSN： 0889-1575

年卷期： 2025 年 139 卷

页码：

收录情况： SCI

摘要： Ethephon (ETH), is an important phytohormone used as a pesticide in agriculture, the overuse of which has caused numerous health problems due to its toxicity. There is an urgent requirement to establish a testing platform that is convenient, accurate, and sensitive in detecting ETH. Herein, we devised an imine groups-based covalent organic framework (COF) with methoxy group as a fluorescent probe for ETH detection. This COF contained a rich imine structure which facilitated acids-responsive characteristics, leading to increased fluorescence response when protonated. Upon exposure to ETH, there was a notable increase at 510 nm, triggering a color transition in fluorescence from yellow to green. This change in fluorescence intensity was directly correlated with ETH concentrations ranging from 0.1 mg/L to 400 mg/L, with a limitation of detection as low as 0.05 mg/L. The practicality was demonstrated through the detection of ETH in strawberries, pepino melon, and persimmons, showing its potential for broad application in ETH analysis.

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