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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Researchers developed a novel fluorescent probe, Naph-DFOB, for highly selective detection of hypochlorite (ClO⁻). This probe enables sensitive imaging of intracellular ClO⁻ and aids in studying diseases like acute lung injury.

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Area of Science:

  • Analytical Chemistry
  • Biomedical Imaging
  • Chemical Biology

Background:

  • Hypochlorite (ClO⁻) is a crucial reactive oxygen species involved in various physiological and pathological processes.
  • Developing selective and sensitive probes for ClO⁻ detection is essential for biological research and disease diagnosis.
  • Existing probes often suffer from low selectivity or complex detection mechanisms.

Purpose of the Study:

  • To design and synthesize a novel ratiometric fluorescent probe for selective detection of hypochlorite (ClO⁻).
  • To investigate the probe's performance in terms of sensitivity, selectivity, and response mechanism.
  • To demonstrate the probe's utility for imaging intracellular ClO⁻ and studying disease models.

Main Methods:

  • A new strategy based on ClO⁻-triggered chlorination and pKa decrease of phenols was employed.
  • Synthesis and characterization of the ratiometric fluorescent probe Naph-DFOB.
  • In vitro and in vivo fluorescence imaging experiments using two-photon excitation.
  • Application of the probe in a lipopolysaccharide (LPS)-induced acute lung injury mouse model.

Main Results:

  • The developed probe Naph-DFOB exhibited a ratiometric fluorescence change (509 nm to 628 nm) in response to ClO⁻.
  • The probe demonstrated high sensitivity and selectivity for ClO⁻ detection.
  • Intracellular ClO⁻ in living cells was successfully imaged using two-photon excitation.
  • Naph-DFOB proved effective in investigating LPS-induced acute lung injury in a mouse model.

Conclusions:

  • A novel, highly selective, and sensitive two-photon ratiometric fluorescent probe (Naph-DFOB) for ClO⁻ detection was successfully developed.
  • The probe's mechanism relies on ClO⁻-triggered chlorination and pKa-dependent fluorescence.
  • Naph-DFOB is a valuable tool for real-time imaging of intracellular ClO⁻ and studying related biological processes and diseases.