Behnam ASHRAFI, Parvin RAMAK, Gholam Reza TALEI, Behrouz EZATPOUR

Biological activity and chemical composition of the essential oil of Nepeta cataria L

In this study, chemical composition, antioxidant and antimicrobial activity of the essential oil of Nepeta cataria L., a native plant that grows in Lorestan region of Iran, were studied. Chemical constituents of the essential oil were identified by means of gas chromatography/mass spectrometry (GC/MS) and the relative content of each constituent was determined by area normalization. Disc diffusion and broth microdilution assays were used for in vitro antimicrobial screening. Antioxidant activity was employed by 2,2-diphenyl-1-picrylhydrazyl (DPPH) free-radical scavenging. The predominant bioactive ingredients with high percentage in N. Cataria essential oil was 4a-α, 7-α, 7a-βNepetalactone (53.87%). The essential oil’s IC50 value of 80.62 μg / mL in the DPPH assay, could be regarded as its strong antioxidant potential. The antibacterial activities of the essential oil were screened and compared against dozen important human pathogens. The essential oil showed good antibacterial activity, especially on Salmonella spp.. The biggest diameters of inhibition zones (29 mm) was recorded for Salmonella typhi and Salmonella paratyphi A showed the lowest MIC (160 μg / mL).

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