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Background Cuminum cyminum L., commonly known as cumin, has been traditionally used in Thai traditional medicine and traditional food flavoring. The present study investigated the chemical composition, antimicrobial activity against all tested major food-borne pathogenic bacteria, and bioactive components of essential oil extracted from C. cyminum L. collected in Thailand. Methods The main components of the essential oil were investigated by gas chromatography-mass spectrometry (GC-MS) technique. Antibacterial activities against Bacillus cereus, Staphylococcus aureus, Escherichia coli, and Salmonella Typhi were investigated by disk diffusion and microdilution method. The presence of the biologically active antibacterial components was also confirmed by the thin-layer chromatography (TLC)-bioautography. Results The main components of the essential oil investigated by GC-MS were cuminaldehyde (27.10%), beta-pinene (25.04%) and gamma-terpinene (15.68%). The essential oil exhibited antibacterial activity against B. cereus, S. aureus, E. coli and S. Typhi. The essential oil showed the strongest antimicrobial activity against B. cereus with a comparable inhibition zone to tetracycline. TLC confirmed the presence of biologically active antibacterial component in the essential oil against all tested food-borne bacteria. It is further demonstrated that cuminaldehyde was the most active compound in TLC-bioautography which inhibited all of tested bacteria. Conclusions Essential oil extracted from C. cyminum L. exhibited antibacterial activity against all tested major food-borne pathogenic bacteria. Cuminaldehyde is a major bioactive component. Our results suggest that the essential oil extracted from C. cyminum L. could be applied as an alternative natural preservative to control food-borne disease and have the potential for further development of new antibacterial agents.

journal of complementary and integrative medicine

Antibacterial activity of cuminaldehyde on food-borne pathogens, the bioactive component of essential oil from  Cuminum cyminum  L. collected in Thailand