Photoacoustic Spectroscopy-Based Breath Analysis for SIBO

Area of Science:

• Gastroenterology and Medical Diagnostics
• Analytical Chemistry and Spectroscopy
• Biomedical Engineering

Background:

• Breath gas analysis, specifically hydrogen (H2) and methane (CH4), is crucial for diagnosing gastrointestinal disorders like lactose intolerance and small intestinal bacterial overgrowth (SIBO).
• Current diagnostic methods may require improvement in sensitivity and specificity for accurate clinical application.
• Photoacoustic spectroscopy (PAS) offers a sensitive technique for gas detection.

Purpose of the Study:

• To develop and validate a novel photoacoustic spectroscopy (PAS) method for simultaneous detection of H2 and CH4 in breath.
• To establish a new approach for measuring H2 concentration by utilizing the linear relationship between breath carbon dioxide (CO2) resonant frequency and H2 levels within a resonant PAS cell.
• To assess the minimum detectable limits (MDLs) of H2, CH4, and CO2 using the developed PAS system to ensure clinical diagnostic utility.

Main Methods:

• Utilized a resonant photoacoustic spectroscopy (PAS) system for gas detection.
• Developed a novel method for H2 concentration measurement based on the resonant frequency shift of CO2 in response to H2 presence.
• Experimentally determined the minimum detectable limits (MDLs) for H2, CH4, and CO2.

Main Results:

• Achieved minimum detectable limits (MDLs) of 8.86 ppm for H2, 0.56 ppm for CH4, and 145.14 ppm for CO2.
• Demonstrated a linear relationship between the resonant frequency of CO2 and H2 concentration, enabling accurate H2 measurement.
• The obtained MDLs meet the sensitivity requirements for clinical breath diagnosis.

Conclusions:

• The novel PAS-based approach provides a sensitive and accurate method for breath H2 and CH4 analysis.
• The technique's ability to measure H2 via CO2 resonant frequency offers a unique and potentially more robust diagnostic tool.
• This method shows significant promise for improving the diagnosis of various gastrointestinal disorders through non-invasive breath testing.