Peppermint protocol: first results for gas chromatography-ion mobility spectrometry

Area of Science:

• Analytical Chemistry
• Biomedical Engineering
• Respiratory Medicine

Background:

• The Peppermint Initiative aims to standardize breath analysis methods.
• Gas chromatography-ion mobility spectrometry (GC-IMS) is a promising technique for breath analysis.
• Standardized benchmark data is needed to support GC-IMS in clinical applications.

Purpose of the Study:

• To provide benchmark washout data for GC-IMS using peppermint oil as a model.
• To identify key volatile compounds in breath after peppermint ingestion.
• To establish a standardized method for breath analysis using GC-IMS.

Main Methods:

• Five Peppermint Experiments using GC-IMS with a tritium ionisation source.
• Headspace analysis of peppermint oil capsules and analysis of exhaled breath.
• Twenty-five washout experiments monitoring eucalyptol levels over time.
• Evaluation of clinical deployments with five additional washout tests.

Main Results:

• Identified eucalyptol, β-pinene, α-pinene, and limonene as major peppermint compounds in breath.
• Eucalyptol was selected as the primary marker for GC-IMS benchmarking.
• Established a benchmark washout time of 367 minutes for exhaled eucalyptol to return to baseline.
• Determined the maximum number of discernible volatile organic compounds in breath samples.

Conclusions:

• GC-IMS is suitable for breath analysis, with eucalyptol as a reliable marker.
• The established benchmark data supports the standardization of breath analysis methods.
• Further research can refine GC-IMS applications in clinical settings and diagnostics.