1. A benzothiazole-based "on-off" fluorescence probe for the specific detection of Cu2+ and its application in solution and living cells.
- Author
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Zhao, Li-xia, Chen, Kun-yu, Xie, Kai-bo, Hu, Jia-jun, Deng, Meng-yu, Zou, Yue-li, Gao, Shuang, Fu, Ying, and Ye, Fei
- Subjects
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INTRAMOLECULAR proton transfer reactions , *FLUORESCENCE , *FLUORESCENCE quenching , *FLUORESCENT probes , *MEMBRANE permeability (Biology) , *DETECTION limit , *BIO-imaging sensors - Abstract
In this paper, a novel fluorescent probe HBT-H based on benzothiazole has been designed and synthesized. The probe has excellent selectivity and can be used for specific detection of Cu2+. Under 360 nm UV excitation, the probe HBT-H itself has a fluorescence emission peak at 487 nm, emitting cyan blue fluorescence, fluorescence quenching after added Cu2+. The detection limit of Cu2+ recognition by HBT-H probe was calculated as 3.08 × 10−7 M. According to Job's plot and high resolution mass spectrometry, the complexation ratio of HBT-H to Cu2+ was 2:1. The sensor mechanism was confirmed as excited intramolecular proton transfer (ESIPT). Surprisingly, the probe HBT-H system responded well to pH, showing green fluorescence under acidic conditions and cyan blue fluorescence under alkaline conditions. In addition, the probe HBT-H has excellent membrane permeability and low cytotoxicity, which could not only detect Cu2+ in actual water samples, but also recognize Cu2+ in human breast cancer cells (MCF-7). [Display omitted] • The probe could selectively detect Cu2+ from solutions or water samples. • The detection limit of Cu2+ with this probe was as low as 3.08 × 10−7 M. • The probe could be used to judge the acid-base properties colorimetrically. • The probe was successfully applied to the imaging of human breast cancer cells. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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