Ultrasensitive and versatile hydrogen peroxide sensing via fluorescence quenching

Area of Science:

• Analytical Chemistry
• Chemical Sensing
• Materials Science

Background:

• Hydrogen peroxide (H2O2) is a key biomarker in various biological and environmental processes.
• Accurate detection of H2O2 is crucial for diagnostics and monitoring.
• Existing H2O2 sensors often lack sensitivity or versatility.

Purpose of the Study:

• To develop an ultra-sensitive fluorescence sensor for hydrogen peroxide detection.
• To investigate the sensor's performance in different detection modes (solution and vapor).
• To assess the sensor's stability and applicability on a solid support like paper.

Main Methods:

• Utilized the highly efficient reaction between bimane and hydrogen peroxide.
• Developed a turn-off fluorescence sensing mechanism.
• Immobilized the sensor onto paper for solid-state detection.
• Evaluated sensor performance using fluorescence spectroscopy.

Main Results:

• Achieved an ultra-low detection limit of 7.9 picomolar (pM) for hydrogen peroxide.
• Demonstrated high sensitivity and efficiency in the fluorescence quenching reaction.
• Confirmed sensor functionality in both solution-state and vapor-phase detection.
• Maintained sensor efficacy when adsorbed onto paper.

Conclusions:

• The developed bimane-based fluorescence sensor offers unprecedented sensitivity for hydrogen peroxide.
• The sensor's adaptability to paper supports enables portable and field-deployable H2O2 detection.
• This technology holds promise for sensitive and versatile hydrogen peroxide monitoring in diverse applications.