New graphene fiber coating for volatile organic compounds analysis

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Volatile organic compounds (VOCs) in exhaled breath are potential biomarkers for various diseases.
• Accurate and sensitive detection of VOCs in breath is crucial for non-invasive diagnostics.

Purpose of the Study:

• To develop a novel graphene-based solid-phase microextraction (SPME) method coupled with gas chromatography/mass spectrometry (GC/MS).
• To analyze trace amounts of VOCs in human exhaled breath vapor.
• To evaluate the method's performance for distinguishing between lung cancer patients and healthy individuals.

Main Methods:

• A graphene fiber coating was synthesized using a one-step hydrothermal reduction reaction.
• The graphene fiber exhibited a porous and wrinkled structure, enhancing extraction efficiency.
• The method involved SPME for VOCs from breath, followed by GC/MS analysis.

Main Results:

• The developed graphene-based SPME-GC/MS method showed excellent extraction efficiency for eight target VOCs (n-alkanes, n-aldehydes, aromatic compounds).
• The method achieved low limits of detection (1.0–4.5 ng/L), good reproducibility (3.8–13.8%), and high recoveries (93–122%).
• The technique was successfully applied to analyze breath samples from lung cancer patients and healthy individuals.

Conclusions:

• The novel graphene-based SPME-GC/MS method is a simple, non-invasive, cost-efficient, and sensitive approach for monitoring VOCs in human breath.
• This method provides a new possibility for the early detection and diagnosis of diseases through breath analysis.