荧光
胺气处理
离子液体
化学
离子
离子键合
分子
氢键
傅里叶变换红外光谱
光化学
组合化学
化学工程
有机化学
催化作用
物理
量子力学
工程类
作者
Siying Che,Shanlin Pan,Xusheng Shao,Ben Zhong Tang,Qijia Shou,Haiyan Fu,Yuanbin She
标识
DOI:10.1016/j.foodchem.2023.136946
摘要
Herein, a functionalized ionic liquid (IL) 7-HDCP (7-hydroxycoumarin-quaternary phosphorus) was developed as NH3 trapping agents and fluorescent indicators to achieve in-time and on-site detection of seafood freshness. Interestingly, the IL displayed remarkable blue fluorescence “turn-on” enhancement to gaseous amine due to excellent amine solubility. By FTIR and 1H NMR spectrogram, this fluorescence “turn-on” phenomenon originated from the weak hydrogen bonding between the ester group of the coumarin functional group and the ammonia molecule. Moreover, the IL exhibited a rapid response (<11 s), prominent sensitivity (0.12 ppm), excellent selectivity (10 interfering substances) and outstanding reversibility (>22 cycles). Benefiting from ion characters, 7-HDCP obtained advantages of easy-to-fabricate and easy-to-use, which was fabricated by one-step simple immersion without aggregation-caused quenching phenomenon. This portable and sensitive smart label made of ion probes facilitates the timely and on-site NH3 detection in the early deterioration stages of aquatic products, enabling “early detection, early warning, and early treatment”.
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