Chemical Composition and Antibacterial Activity of Essential Oils from Flowers, Seeds and Stems of Heracleum rechingeri (Manden) from Iran

The essential oils of aerial parts of Heracleum rechingeri (flowers, seeds and stems) were obtained by hydrodistillation and analyzed by using GC (retention indices) and GC-MS. Twenty-one components (representing 98.7 %) were characterized for the flowers oil, whereas sixteen components (representing 97.4 %) were the major constituents of stem's oil and four components (representing 99.1 %) were characterized for the seeds oil. The antimicrobial activity of the essential oils was tested against six different bacteria by disc diffusion method and showed maximum inhibitory activity against Gram-positive bacteria, especially against Bacillus subtilis and Staphylococcus aureus.