Novel forster resonance energy transfer (FRET)-based ratiometric fluorescent probe for detection of cyanides by nucleophilic substitution of aromatic hydrogen (SNArH)

被引:0
作者
She, Qiunan [1 ]
Cao, Yingmei [2 ]
Zhou, Yicong [1 ]
Tan, Yingming [1 ]
Kan, Aoran [1 ]
Yang, Jie [1 ]
Yan, Jinwu [2 ]
Wu, Jingjing [1 ]
Liu, Chuanxiang [1 ]
机构
[1] Shanghai Inst Technol, Sch Chem & Environm Engn, Shanghai 201418, Peoples R China
[2] South China Univ Technol, Sch Biol & Biol Engn, MOE Int Joint Res Lab Synthet Biol & Med, Guangzhou 510006, Peoples R China
关键词
FRET; Probe; Ratiometric fluorescence; Cyanides; Naphthalimide; Coumarin; Cell image; TURN-ON; NAKED-EYE; CHEMOSENSOR; ION; STRATEGY; DONOR; CU2+;
D O I
10.1016/j.saa.2024.125339
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
The development of novel fluorescent probes for real-time detection of cyanides (CN-) in environmental and biological systems has become a significant focus in chemical sensing. Particularly, ratiometric fluorescence sensing offers a unique method for precise and quantitative detection of cyanides, even under complex conditions. We report herein the design of a new ratiometric fluorescent probe for cyanides based on modulation of Fo<spacing diaeresis>rster resonance energy transfer (FRET) coupled with novel cyanide-induced nucleophilic substitution of aromatic hydrogen (SNArH). The target probe (R1) is developed by introducing coumarin fluorophores as FRET donors into a 3-nitro-naphthalimide acceptor, which is easily synthesized and exhibits a colorimetric change from colorless to faint yellow and a significant ratiometric fluorescence shift (Delta lambda = 114 nm) upon cyanide binding. A clear ratiometric signal at I582/I468 was obtained, with a limit of detection of 5.69 mu M. The sensing mechanism was confirmed through 1H NMR titration and LC-MS analysis. Additionally, R1-loaded strips were easily prepared, serving as a portable device for detecting CN- with visible color changes. The probe R1 has been successfully utilized for real-time monitoring of cyanide in food materials and water samples. Importantly, fluorescence bioimaging studies in HeLa cells were conducted, demonstrating the probe's capability for ratio- metric detection of exogenous CN- in living systems.
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页数:8
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