Sensitive spectroscopic breath analysis by water condensation

Area of Science:

• Analytical Chemistry
• Biomedical Engineering
• Clinical Diagnostics

Background:

• Breath analysis is a promising non-invasive diagnostic tool.
• Endogenous volatile organic compounds (VOCs) in breath reflect metabolic states and diseases.
• High water content in breath hinders VOC identification.

Purpose of the Study:

• To present a novel water suppression technique for breath analysis.
• To enable identification of specific trace gases in breath samples.
• To validate the technique's clinical relevance and impact on VOC concentrations.

Main Methods:

• Development of a water suppression technique for breath samples.
• Utilizing Fourier-transform infrared spectroscopy for trace gas identification.
• Quantification of water reduction and assessment of VOC stability during sample preparation.

Main Results:

• The technique reduces water concentration in breath samples by a factor of 2500.
• Sample preparation and data acquisition are completed within a clinically relevant timeframe of approximately 25 minutes.
• Water elimination does not significantly alter the concentrations of key trace gases like methane, acetone, and isoprene.

Conclusions:

• The developed water suppression technique effectively enhances VOC analysis in breath.
• This method facilitates the identification of disease-specific biomarkers in breath.
• The technique shows potential for routine clinical diagnostics and disease monitoring.