Highly Selective Volatile Organic Compounds Breath Analysis Using a Broadly-Tunable Vertical-External-Cavity...

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Laser Technology

Background:

• Breath analysis offers a non-invasive method for diagnosing various health conditions.
• Acetone in breath is a potential biomarker for metabolic states like diabetes.
• Accurate and sensitive detection of breath acetone is crucial for clinical applications.

Purpose of the Study:

• To develop and demonstrate a broadly tunable mid-infrared laser spectroscopic system for direct breath acetone measurement.
• To assess the system's capability for simultaneous detection of other volatile organic compounds in breath.
• To evaluate the precision and accuracy of acetone quantification in complex breath matrices.

Main Methods:

• Utilized a broadly tunable mid-infrared vertical-external-cavity surface-emitting laser (VECSEL).
• Employed a direct absorption laser spectroscopy setup for gas analysis.
• Investigated spectral interferences from common breath components like water and alcohols.

Main Results:

• Achieved a broad wavelength coverage of over 30 cm^-1 at 3.38 μm.
• Demonstrated unambiguous determination of acetone.
• Attained a precision of 13 ppbv for acetone after 5 minutes of averaging.
• Successfully measured acetone alongside isoprene, ethanol, methanol, methane, and water.

Conclusions:

• The developed VECSEL-based laser spectroscopy system is effective for sensitive and selective breath acetone analysis.
• The system's broad tunability enables simultaneous monitoring of multiple breath biomarkers.
• This technology holds promise for non-invasive disease diagnostics through breath analysis.