Investigating the impact of packaging on oat volatiles using GC×GC–TOF MS

Significance of the Topic

Rolled oats readily absorb volatile compounds from their environment, which can alter flavor, aroma, and safety. Packaging materials are potential sources of migrating volatiles that affect product quality and consumer acceptance. Understanding these interactions is essential for food quality control and safety compliance.

Objectives and Study Overview

This study evaluated how different packaging types influence the volatile profile of rolled oats. Six commercial oat samples packaged in paper, plastic, and cardboard were analyzed to identify packaging-derived contaminants and changes in aroma compounds. The goal was to develop a robust non-target screening workflow and demonstrate rapid troubleshooting approaches for industrial applications.

Methodology and Instrumentation

• Sampling: Headspace sorptive extraction using HiSorb probes (30 µL PDMS/CWR/DVB phase) at 70 °C for 45 min.
• Separation and Detection: Comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry (GC×GC–TOF MS) equipped with an INSIGHT-Flow modulation system.
• Data Processing: Tile-based chemometric analysis via ChromCompare+ with tile widths of 12 s (1tR) and 0.75 s (2tR), 20% overlap.
• Pairwise Comparison: Smart Subtract algorithm for rapid differential analysis between sample pairs.

Main Results and Discussion

• Approximately 250–300 volatile components were detected per sample, yielding over 100 000 unique features across 18 analyses.
• PCA revealed clear clustering by packaging type, indicating significant influence of packaging on oat volatiles.
• Thirty-three key differentiators were identified; 25 of these were confirmed in the corresponding packaging material.
• Plastic packaging contributed compounds such as triacetin and chlorinated toluenes, while cardboard packaging elevated levels of 2-ethyl hexanol and styrene.
• Paper packaging showed increased cyclohexanone, trimethylpyrazine, and several phenolic compounds.
• Smart Subtract facilitated rapid isolation of differences between two plastic-packaged samples (Brands E and F), revealing key markers responsible for sensory variations.

Benefits and Practical Applications

• Demonstrated a comprehensive non-target approach capable of detecting both aroma compounds and potential packaging contaminants in food matrices.
• Provided a workflow for quality control laboratories to monitor packaging migration effects without extensive method development.
• Smart Subtract offers a fast troubleshooting tool for industrial complaints, reducing data processing time and focusing on relevant differences.

Future Trends and Potential Applications

As packaging materials evolve, advanced analytical methods like GC×GC–TOF MS combined with sorptive extraction will be critical to ensure food integrity. Machine learning–driven chemometrics and automated subtraction algorithms are poised to enhance data interpretation speed and accuracy. Wider adoption of high-throughput sampling probes could further streamline routine screening in manufacturing and regulatory environments.

Conclusion

This investigation highlights the significant role of packaging in shaping the volatile profile of rolled oats. The integrated use of headspace sorptive extraction, GC×GC–TOF MS, and advanced data processing enables detailed non-target screening and rapid differentiation of sample pairs. The methodology supports improved food quality assurance by identifying and quantifying migrating packaging compounds.

References

• Muncke J (2021) Tackling the toxics in plastics packaging. PLoS Biol 19(3).
• Circular Economy: Now or Never. Inter-American Development Bank Sustainability Blog.