Sensitivity of activatable reactive oxygen species probes by fluorescence spectroelectrochemistry

Steven T. Wang, Natalia G. Zhegalova, Tiffany P. Gustafson, Andrew Zhou, Joel Sher, Samuel Achilefu, Oleg Y. Berezin, Mikhail Y. Berezin

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We have developed a new analytical method of evaluating activatable fluorescent probes for ROS detection using integrated fluorescence spectroelectrochemistry. The Tafel formalism was applied to describe the process of the probes' oxidation under electrochemical conditions and identify a novel parameter defined as the threshold oxidation potential. This potential can serve as an approximation to the equilibrium potential and can be utilized for determining the sensitivity of a probe to oxidation. Based upon the measured values of threshold potentials, the order of sensitivity towards oxidation among several commonly used probes was determined to be the following (from highest to lowest): 2,7-dihydrodichlorofluorescein > dihydroethidium > dihydrorhodamine 123 > dihydrorhodamine 6G. The presented approach opens up a new direction in synthesizing and screening novel ROS probes with a well-defined sensitivity for in vitro and in vivo applications.

Original languageEnglish (US)
Pages (from-to)4363-4369
Number of pages7
Issue number15
StatePublished - Aug 7 2013
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry


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