New Approach to Food Smell Analysis Using Combination of GCMS™ and GC-SCD (1)

Importance of the Topic

Food odor analysis is essential in food quality control and flavor profiling. Sulfur-containing volatiles, although often present in trace amounts, significantly influence aroma. Traditional GC–MS excels at qualitative profiling but can struggle with low-abundance sulfur compounds. Combining GC–MS with sulfur chemiluminescence detection (GC-SCD) offers both broad compound coverage and targeted sensitivity for sulfur species.

Objectives and Overview of the Study

This work evaluates a hybrid analytical workflow that integrates GC–MS and GC-SCD to characterize odor compounds released from packaged kimchi. The primary goals are to achieve comprehensive volatile profiling and selective, high-sensitivity detection of sulfur compounds.

Methodology and Sample Preparation

• Sample preparation: 5 g of commercial kimchi sealed in a polyethylene bag.
• Volatile capture: MonoTrap adsorbent placed alongside the sample for 2 h at room temperature.
• Desorption: MonoTrap extracted with 1 mL of diethyl ether/n-pentane (1:1).
• Chromatographic conditions: Split injection (1 µL, split ratio 1:5) under constant He pressure; InertCap 5MS/Sil column; temperature program 50 °C (5 min) → 250 °C at 10 °C/min.

Used Instrumentation

• GC-SCD: Nexis GC-2030 coupled to SCD-2030 chemiluminescence detector.
• GC–MS: Shimadzu GCMS-QP2020NX with electron ionization source.
• Column: InertCap 5MS/Sil (30 m × 0.32 mm I.D., 0.50 µm film).

Main Results and Discussion

• GC-SCD selectively detected eight sulfur compounds, including allyl methyl sulfide and dimethyl trisulfide, at trace levels.
• GC–MS total ion chromatogram identified four sulfur species alongside other volatiles such as alcohols and ketones.
• GC–MS provided a broad aroma profile, while GC-SCD offered enhanced sensitivity and selectivity for sulfur volatiles.

Benefits and Practical Applications

This dual-technique approach improves odor profiling by combining comprehensive compound identification with targeted sulfur analysis. It is valuable for food quality assurance, flavor optimization, and off-odor investigation in the food industry.

Future Trends and Potential Applications

• Real-time or dynamic sampling strategies for continuous odor monitoring.
• Coupling with multidimensional GC or high-resolution MS to resolve complex matrices.
• Extension of the method to diverse food and beverage products for aroma fingerprinting.

Conclusion

The combination of GC–MS and GC-SCD presents a powerful platform for in-depth aroma analysis. It enables both comprehensive volatile profiling and sensitive detection of trace sulfur compounds, advancing food odor research and quality control.

References

• Takemori Y., Kawamura K., Ishii T. Shimadzu Application Note No. M288, First Edition, February 2020.