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Area of Science:

  • Biochemistry
  • Chemical Biology
  • Analytical Chemistry

Background:

  • Peroxynitrite (ONOO-) is a reactive species involved in inflammatory diseases.
  • Detecting ONOO- in biological systems is difficult.
  • Boronate probes are promising for ONOO- detection.

Purpose of the Study:

  • To develop a novel, specific method for detecting peroxynitrite (ONOO-).
  • To utilize the ONOO--mediated formation of a phenyl radical intermediate for fluorescence detection.
  • To characterize the reaction products of a boronate probe with ONOO-.

Main Methods:

  • Investigated the oxidation of benzophenone-2-boronic acid by ONOO-.
  • Identified reaction products using spectroscopic techniques.
  • Monitored fluorenone (FLN) formation via fluorescence spectroscopy.
  • Validated the method for detecting ONOO- generated in situ.

Main Results:

  • ONOO- oxidation of the boronate probe yields a phenyl radical intermediate.
  • This intermediate undergoes cyclization to form fluorescent fluorenone (FLN).
  • FLN and 2-nitrobenzophenone are minor, ONOO--specific products, distinct from the major phenolic product.
  • FLN formation is specific to ONOO- and not observed with hydrogen peroxide.

Conclusions:

  • A new fluorescence-based detection principle for ONOO- has been established.
  • This method relies on the specific detection of the ONOO--generated fluorenone product.
  • This approach enables noninvasive, fluorescence-based monitoring of ONOO- in biological contexts.