Hydrogen peroxide detection in wet air with a Prussian Blue based solid salt bridged three electrode system

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Biosensing

Background:

• Hydrogen peroxide (H2O2) is a biomarker in exhaled breath condensate (EBC).
• Current methods for H2O2 detection in EBC are often invasive and complex.
• A need exists for simple, noninvasive H2O2 detection methods.

Discussion:

• A novel electroanalytical system utilizing a Prussian Blue modified electrode was developed.
• The system detects H2O2 in aerosolized samples, simulating exhaled human breath.
• A salt-saturated filament bridges a three-electrode structure for aerosol sensing.

Key Insights:

• The system exhibits a linear response to H2O2 in the 0.1-10 μM range, relevant to EBC levels.
• High sensitivity (8 A M⁻¹ cm⁻²) and stability (over 50 cycles within 3 days) were demonstrated.
• The sensor accurately quantifies H2O2 in aerosol mimicking breath.

Outlook:

• This system serves as a prototype for a noninvasive diagnostic tool for pulmonary conditions.
• It simplifies H2O2 analysis by avoiding intermediate EBC collection.
• Further development could lead to a portable device for real-time breath analysis.