Antimicrobial effect of some essential oils

Commercially available oils of lavender (Lavandula angustifolia Mill.), lemon-balm (Melissa officinalis L.), juniper berry (Juniperus communis L.), lemon verbena (Lippia citriodora Knuth), rosemary (Rosmarinus officinalis L.) and cypress (Cupressus sempervirens L.) were evaluated for their antimicrobial activity Analyses of the oils by GC-FID and GUMS revealed that the major constituents of these oils were linalool (23.1%) and linalyl acetate (23.1%) in lavender, citronellal (23.8%) and geranial (11.6%) in lemon-balm, alpha-pinene (29.2%) in juniper berry, neral (36.2%) and geranial (41.9%) in lemon verbena, 1,8-cineole (24.4%) and camphor (17.1%) in rosemary, alpha-pinene (31.1%) and delta-3-carene (18.6%) in cypress oil. The antimicrobial activity of the essential oils was evaluated on survival and growth of some microorganisms potentially dangerous to the safety of foods (Escherichia coli, Staphylococcus aureus, Listeria innocua). The antimicrobial tests were carried out both in solid and in liquid media. E. coli was the most sensitive organism among the tested ones to the inhibition effect of the oils.