leyla ghodrati

The aim of this research was to the antibacterial effects of essential oils(EOs) of Lemon balm (Melissa officinalis L.). Lemon balm is one of the important medicinal plants species, member of Lamiaceae(formerly Labiatae) family. Aerial parts plant collected in Knowledge Based Research Station researchers, drug companies green and After drying, the extract was used for.The chemical composition was determined by hydro-distillation. Antibacterial activity essential oils against a panel of micro organisms including 5 bacteria strains (3 Grampositive and 2 Gram-negative), were assessed by disc diffusion method and broth micro dilution method. The essential oils showed antibacterial activity against the Gram-positive bacteria. The essential oil was more than 30mm on Gram-positive bacteria, however, It effact strong against then bacteria and also, Comparison of essential oil showed antibacterial activity against Gram-positive bacteria, the essential oil have been effective to these micro organisms. But its effects were relatively less. The results showed the study of antibacterial activity of essential oil Lemon balm plant against bacterias was not to same Inhibition zone. More inhibition zone was because effect of essential oil against S. aureus bacteria and less effect was against S. marcescens bacteria. The essential oil of Lemon balm can be used for treatment of some diseases.