Exceptional time response, stability and selectivity in doubly-activated phenyl selenium-based glutathione-selective...

Area of Science:

• Chemical Biology
• Analytical Chemistry
• Biochemistry

Background:

• Glutathione (GSH) is a crucial endogenous antioxidant.
• Accurate detection of GSH is vital for understanding cellular redox states.
• Existing detection methods often lack selectivity or speed.

Purpose of the Study:

• To develop a fluorescent probe for selective and rapid detection of GSH.
• To differentiate GSH from similar amino acids like cysteine (Cys) and homocysteine (Hcy).
• To achieve sensitive GSH detection without background fluorescence.

Main Methods:

• Synthesis of a phenyl-selenium-substituted coumarin derivative.
• Fluorescence spectroscopy to assess probe response to GSH, Cys, and Hcy.
• Confocal microscopy for cellular imaging and validation in Hep3B cells.

Main Results:

• The probe exhibited a ~100-fold fluorescence enhancement with GSH.
• Highly selective detection of GSH over Cys and Hcy was achieved.
• Sub-second fluorescence intensity attainment (within 100 ms) was observed.
• Probe selectivity was confirmed in live Hep3B cells via imaging.

Conclusions:

• The developed coumarin probe provides a highly selective and rapid method for GSH detection.
• This probe is suitable for real-time monitoring of GSH in biological systems.
• The probe's performance suggests potential applications in diagnostics and cellular studies.