Department of Chemistry
Ratiometric emission fluorescent pH probe for imaging of living cells in extreme acidity
© 2015 American Chemical Society. A novel ratiometric emission fluorescent probe, 1,1-dimethyl-2-[2-(quinolin-4-yl)vinyl]-1H-benzo[e]indole (QVBI), is facilely synthesized via ethylene bridging of benzoindole and quinoline. The probe exhibits ratiometric fluorescence emission (F522nm/F630nm) characteristics with pKa 3.27 and linear response to extreme-acidity range of 3.8-2.0. Also, its high fluorescence quantum yield (φ = 0.89) and large Stokes shift (110 nm) are favorable. Moreover, QVBI possesses highly selective response to H+ over metal ions and some bioactive molecules, good photostability, and excellent reversibility. The probe has excellent cell membrane permeability and is further applied successfully to monitor pH fluctuations in live cells and imaging extreme acidity in Escherichia coli cells without influence of autofluorescence and native cellular species in biological systems.
Source Publication Title
American Chemical Society
Niu, Weifen, Li Fan, Ming Nan, Zengbo Li, Dongtao Lu, Man Shing Wong, Shaomin Shuang, and Chuan Dong. "Ratiometric emission fluorescent pH probe for imaging of living cells in extreme acidity." Analytical Chemistry 87.5 (2015): 2788-2793.