Imaging Science and Photochemistry ›› 2016, Vol. 34 ›› Issue (5): 435-443.DOI: 10.7517/j.issn.1674-0475.2016.05.435

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Construction of a Ratiometric Fluorescent Probe for SO2 Derivative and Its Application for Cell Imaging

XIONG Chao, DUAN Chong, XU Junchao, HE Yuanyuan, ZHANG Yue, ZENG Lintao   

  1. School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China
  • Received:2016-07-27 Revised:2016-08-11 Online:2016-09-15 Published:2016-09-15

Abstract:

In this study, we report a ratiometric fluorescent probe (CZBI) for sulfur dioxide (SO2) derivatives based on the conjugate of carbazole and benzo[e]indolium, which displays colorimetric and ratiometric fluorescence dual response to HSO3-/SO32-. The probe can quantitatively detect HSO3- with high specificity, fast response (within 40 s) as well as low detection limit (12 nmol/L). The fluorescence intensity ratios were linearly related to the concentrations of bisulfite ranging from 0 to 16 μmol/L. A 1, 4-nucleophilic addition reaction was proposed for the sensing mechanism of this probe, which was confirmed by 1HNMR spectra. Fluorescence imaging of HeLa cells indicated that CZBI could be used for monitoring the intrinsically generated intracellular SO2 derivatives in living cells by ratiometric fluorescence imaging.

Key words: fluorescent probe, SO2, benzoindole, ratiometric, cell imaging