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Sensing of carbon dioxide by a decrease in photoinduced electron transfer quenching.

P Herman1, Z Murtaza, J R Lakowicz

  • 1Department of Biochemistry and Molecular Biology, University of Maryland Baltimore School of Medicine, 725 West Lombard Street, Baltimore, Maryland 21201, USA.

Analytical Biochemistry
|July 16, 1999
PubMed
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This study introduces a novel method for detecting carbon dioxide (CO2) using amine-containing fluorophores. The fluorescence intensity and lifetime of these molecules change predictably with CO2 exposure, offering a direct sensing approach.

Area of Science:

  • Analytical Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Photoinduced electron transfer (PET) quenching is a known mechanism affecting fluorophores.
  • Unprotonated amines can quench fluorophores like naphthalene and anthracene via PET.

Purpose of the Study:

  • To investigate amine-containing fluorophores for direct carbon dioxide (CO2) sensing.
  • To explore the relationship between CO2 partial pressure and fluorescence properties.

Main Methods:

  • Examined fluorescence spectral properties of 1-naphthylmetylamine (NMA) and 9-ethanolaminomethylanthracene (EAA).
  • Measured changes in fluorescence intensity and mean lifetime with varying CO2 concentrations.
  • Assessed the reversibility of fluorescence changes upon CO2 removal.

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Main Results:

  • Both NMA and EAA showed increased fluorescence intensity when exposed to gaseous CO2.
  • NMA's mean fluorescence lifetime increased with rising CO2 partial pressures.
  • Observed complete reversibility of fluorescence changes upon argon purging.

Conclusions:

  • CO2 can be directly detected using amine-containing fluorophores via PET quenching mechanism.
  • Changes in fluorescence are attributed to reduced quenching by amino groups upon CO2 interaction.
  • This method bypasses the need for bicarbonate and pH-sensitive fluorophores in CO2 detection.