Abstract
A new reaction-based, colorimetric fluorescent sensor of BODIPY derivative (1) for cysteine (Cys) has been designd and synthesized. This probe shows highly selective detection of Cys over homocysteine (Hcy), glutathione (GSH) as well as other amino acids with a dramatic color change from wine red to fluorescence green because of the significant increase of the visible light excitable fluorescence intensity with the addition of Cys, due to their different reaction rates of the Michael addition reaction. The detection limit for Cys was 8.57×10−7M. Possible mechanism for sensing of Cys by BODIPY 1 was studied by NMR and HRMS. Probe 1 has been successfully applied to the biological imaging of Cys in living cells.
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