Wenzhou University Researchers Build Comprehensive Broccoli VOC Database Using Dual-Ionization GC-HRMS

Researchers at Wenzhou University (China) developed a curated database of broccoli volatile organic compounds (VOCs) by comprehensively profiling the volatile metabolite composition across multiple broccoli cultivars. They employed solid-phase microextraction (SPME) combined with gas chromatography–high-resolution mass spectrometry (GC-HRMS), using both electron ionization (EI) and chemical ionization (CI) modes. This dual-ionization approach enhances structural elucidation and broadens metabolite coverage, providing a robust foundation for cultivar differentiation, quality assessment, and metabolomics-guided breeding. Their findings were published in Molecules (1).

A popular vegetable, broccoli (Brassica oleracea L. var. italica Plenck) is valued for its culinary versatility as well as its rich nutritional and phytochemical profile. Broccoli is an acknowledged source of essential vitamins, especially C, K, and folate, minerals, dietary fiber, and bioactive compounds such as glucosinolates and flavonoids (2). In addition to its nutritional value, broccoli has become as a model species in plant science because of its well-characterized glucosinolate–myrosinase system (3,4). It’s considered a nutritionally relevant crop (5), and its appropriateness for research on secondary metabolism (6,7), flavor biochemistry (8), stress responses (9), harvest physiology (10), and phytochemical profiling (11). Collectively, these attributes have led the Wenzhou University team to consider broccoli a tractable and informative system for both basic and applied plant research (1).

In this study, a pooled sample derived from 191 broccoli cultivars was analyzed to maximize chemical diversity and minimize biological variability. A total of 206 volatile compounds spanning nine chemical classes were detected using the SPME-GC-HRMS technique with dual ionization modes (EI and CI), 37 of which were confirmed via CI-based molecular ion information. The constructed database was validated using florets from seven distinct cultivars, where 90.78% of the compounds were successfully identified, and a conserved core set of 37 volatiles was observed. Chemical class-specific patterns and cultivar-level differences were further characterized using multivariate analysis. Additionally, freeze-dried sample preparation was validated as a reliable approach for large-scale volatile profiling (1).

Overall, the researchers believe their comprehensive and versatile database provides a valuable resource for future broccoli metabolomics studies, supporting efforts in cultivar differentiation, sensory trait enhancement, and analysis of environmental responses (1).

References

1. Song, C.; Yan, M.; Lin, S. et al. Dual-Ionization SPME-GC-HRMS Metabolomic Profiling of Broccoli Volatiles for the Construction of a Broccoli Metabolic Database. Molecules Sep 2025, 30 (18), 3781. DOI: 10.3390/molecules30183781
2. Wang, L.; Zhang, Y.; Chen, Y. et al. Investigating the Relationship Between Volatile Components and Differentially Expressed Proteins in Broccoli Heads During Storage in High CO₂ Atmospheres. Postharvest Biol. Technol. 2019, 153, 43–51. DOI: 10.1016/j.postharvbio.2019.03.015
3. Sikorska-Zimny, K.; Beneduce, L. The Glucosinolates and their Bioactive Derivatives in Brassica: A Review on Classification, Biosynthesis and Content in Plant Tissues, Fate During and After Processing, Effect on the Human Organism and Interaction with the Gut Microbiota. Crit. Rev. Food Sci. Nutr. 2021, 61, 2544–2571. DOI: 10.1080/10408398.2020.1780193
4. Nagraj, G. S.; Chouksey, A.; Jaiswal, S. et al. In Nutritional Composition and Antioxidant Properties of Fruits and Vegetables; Jaiswal, A.K., Ed.; Academic Press, 2020; pp. 5–17.
5. Syed, R. U.; Moni, S. S.; Break, M. K. B. et al. Broccoli: A Multi-Faceted Vegetable for Health: An In-Depth Review of its Nutritional Attributes, Antimicrobial Abilities, and Anti-Inflammatory Properties. Antibiotics 2023, 12, 1157. DOI: 10.3390/antibiotics12071157
6. Guan, Y.; Hu, W.; Xu, Y. at al. Proteomic Analysis Validates Previous Findings on Wounding-Responsive Plant Hormone Signaling and Primary Metabolism Contributing to the Biosynthesis of Secondary Metabolites Based on Metabolomic Analysis in Harvested Broccoli (Brassica oleracea L. var. italica). Food Res. Int. 2021, 145, 110388. DOI: 10.1016/j.foodres.2021.110388
7. Hassini, I.; Rios, J. J.; Garcia-Ibañez, P. et al. Comparative Effect of Elicitors on the Physiology and Secondary Metabolites in Broccoli Plants. J. Plant Physiol. 2019, 239, 1–9. DOI: 10.1016/j.jplph.2019.05.008
8. Bell, L.; Oloyede, O. O.; Lignou, S. Taste and Flavor Perceptions of Glucosinolates, Isothiocyanates, and Related Compounds. Mol. Nutr. Food Res. 2018, 62, 1700990. DOI: 10.1002/mnfr.201700990
9. Muthusamy, M.; Lee, S. I. Abiotic Stress-Induced Secondary Metabolite Production in Brassica: Opportunities and Challenges. Front. Plant Sci. 2024, 14, 1323085. DOI: 10.3389/fpls.2023.1323085
10. Ilahy, R.; Tlili, I.; Pék, Z. et al. Pre- and Post-Harvest Factors Affecting Glucosinolate Content in Broccoli. Front. Nutr. 2020, 7, 147. DOI: 10.3389/fnut.2020.00147
11. Kamboj, A.; Sharma, S.; Singh, V. P. et al. Phytochemical and Therapeutic Potential of Broccoli (Brassica oleracea): A Review. Pharma Innov. J. 2023, 12, 633–638.