LIU Jian-hua,WU Yu-lin,SHANG Zhu-ye,WANG Yue,ZHANG Cheng,MENG Qing-tao,ZHANG Zhi-qiang.Coumarin-Copper(Ⅱ)-complex-based Fluorescent Probe for the Detection of NO and Its Application in in vivo Fluorescence Imaging[J].Journal of Instrumental Analysis,2025,44(07):1299-1306.
LIU Jian-hua,WU Yu-lin,SHANG Zhu-ye,WANG Yue,ZHANG Cheng,MENG Qing-tao,ZHANG Zhi-qiang.Coumarin-Copper(Ⅱ)-complex-based Fluorescent Probe for the Detection of NO and Its Application in in vivo Fluorescence Imaging[J].Journal of Instrumental Analysis,2025,44(07):1299-1306. DOI: 10.12452/j.fxcsxb.241029494.
Coumarin-Copper(Ⅱ)-complex-based Fluorescent Probe for the Detection of NO and Its Application in in vivo Fluorescence Imaging
Nitric oxide (NO) is one of three major signaling molecules,which involved in a great amount of physiological and pathological processes in biological systems. In addition,more and more evidences indicate that NO levels are closely related to several human health. Therefore,it is vital to develop a convenient and reliable method for NO detection in biological systems. In this paper,a new coumarin-Cu(Ⅱ) complex-based fluorescent probe
YCY
-Cu
2+
was successfully developed. In the presence of Cu
2+
,coumarin-based ligand
YCY
can specifically perform 1∶1 coordination with Cu
2+
to generate probe
YCY
-Cu
2+
. The strong green fluorescence of ligand
YCY
was quenched due to the paramagnetism of Cu
2+
. When NO was recognized by fluorescent
probe
YCY
-Cu
2+
,the paramagnetic Cu
2+
was reduced to the diamagnetic Cu
+
and released from the complex,and the strong fluorescent emitting N-nitroso compound (
YCY
-NO) are generated to achieve the specific recognition of NO. The structure of the fluorescent probe
YCY
-Cu
2+
and the recognition mechanism toward NO were confirmed by Job's analysis,high-resolution mass spectrometry (HRMS) and spectral titration analysis. The probe
YCY
-Cu
2+
has the advantages of high selectivity and sensitivity (LOD=97.3 nmol/L),wide range of pH applications (3.5-11.5) and low cytotoxicity. Most importantly,the probe has been successfully applied to the fluorescence imaging of NO in living cells and animals.
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references
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