Validating a breath collection and analysis system for the new tuberculosis breath test

Area of Science:

• Biochemistry
• Analytical Chemistry
• Microbiology

Background:

• Tuberculosis (TB) diagnosis relies on invasive methods.
• Volatile organic compounds (VOCs) in breath offer potential for non-invasive diagnostics.
• Previous studies identified some TB-associated VOCs in patient breath.

Purpose of the Study:

• To identify volatile compounds released by Mycobacterium tuberculosis.
• To develop an optimized sample collection and pre-concentration system for a TB breath test.
• To assess the stability of identified volatile compounds for diagnostic purposes.

Main Methods:

• Analysis of volatile compounds released by Mycobacterium tuberculosis.
• Evaluation of different breath collection devices (salinized glass bulbs, Tedlar® TA, Supel(TM) Inert Foil, Supel(TM) Inert Gas bags).
• Testing of various sorbent materials (Tenax® TA) for pre-concentration of volatiles.
• Assessment of volatile compound stability on sorbent cartridges under different conditions.

Main Results:

• Four key volatile compounds identified: methyl phenyl-acetate, methyl nicotinate, methyl p-anisate, and o-phenylanisole.
• Salinized glass sampling bulbs proved superior for breath collection stability.
• Tenax® TA demonstrated universal sorbent capabilities for all four volatiles.
• Identified volatiles remained stable on Tenax® TA cartridges for over two months.

Conclusions:

• The identified volatile compounds have potential for a sensitive, non-invasive tuberculosis breath test.
• Optimized sample collection and pre-concentration methods enhance diagnostic reliability.
• Long-term stability of volatiles on Tenax® TA supports practical application in TB diagnostics.