Rapid Analysis and Structural Analysis of the Components in Foods Using DART and the LCMS-9030

Significance of the Topic

Direct, rapid analysis of food components is critical for quality control and product development in the food industry. Traditional methods often require extensive sample preparation, leading to longer turnaround times and potential analyte loss. The combination of DART ionization with high-resolution Q-TOF mass spectrometry addresses these limitations by enabling direct measurement of solids, liquids, and gases without pretreatment, delivering high mass accuracy and structural insights.

Objectives and Study Overview

This work aims to demonstrate a workflow integrating Direct Analysis in Real Time (DART) with the LCMS-9030 quadrupole time-of-flight mass spectrometer to achieve fast, pretreatment-free profiling and structural elucidation of food components. Chili oil was selected as a model sample to showcase method performance in both positive and negative ionization modes.

Methodology and Instrumentation

• DART-MS analysis performed using an IonSense DART-OS ion source coupled to the LCMS-9030 Q-TOF system.
• Key parameters: DART heater temperature 350 °C, nebulizing gas 0.5 L/min, drying gas 5 L/min, mass range m/z 50–1500 in positive and negative modes, interface and drift tube temperatures at 250 °C and 400 °C, respectively.
• Data acquisition combined Total Ion Chromatograms (TIC) and Extracted Ion Chromatograms (EIC) for selected ions.
• LabSolutions Insight Explore software for compositional formula estimation, compound search via ChemSpider, and MS/MS fragment assignment.

Main Results and Discussion

• Positive mode identified a major peak at m/z 306.2060 (component A), negative mode peaks at m/z 279.2326 (component B) and m/z 281.2482 (component C).
• Compositional formula estimation yielded C18H27NO3 for A, C18H32O2 for B, and C18H34O2 for C with mass errors below 1 mDa.
• Online ChemSpider search and fragment assignment confirmed component A as capsaicin (assign score 96.10), component B as linoleic acid (score 97.19), and component C as oleic acid (score 97.14).
• High-resolution MS/MS spectra provided clear fragment attribution, supporting structural assignments.

Benefits and Practical Applications

• Pretreatment-free direct analysis reduces workflow time and minimizes sample handling.
• High mass accuracy and MS/MS capabilities enable confident identification of complex molecules in food matrices.
• LabSolutions Insight Explore streamlines formula estimation and structural confirmation, facilitating rapid decision-making in product development and quality assurance.

Future Trends and Opportunities

• Integration with automated sampling and robotic platforms for high-throughput screening.
• Expansion to other food matrices, complex mixtures, and real-time process monitoring.
• Advances in data analysis algorithms and expanded spectral libraries to enhance structural prediction accuracy.
• Potential applications in pharmaceuticals, environmental analysis, and metabolomic studies.

Conclusion

The DART–LCMS-9030 workflow delivers a robust, high-throughput platform for direct analysis and structural elucidation of food components. This approach streamlines analytical workflows, providing rapid, accurate results without extensive sample preparation. The combination of high-resolution Q-TOF MS and Insight Explore software empowers laboratories with efficient identification and characterization capabilities.

References

• Nakazono, J., Goda, T., Iida, T. Rapid Analysis and Structural Analysis of the Components in Foods Using DART and the LCMS-9030. Shimadzu Application News 01-00236-EN, First Edition: Sep. 2021.