The composition and antimicrobial activity of the essential oil of Teucrium stocksianum subsp. stocksianum leaf from Oman

Abstract

The essential oil of Teucrium stocksianum Boiss. subsp. stocksianum leaf grown in Oman was analyzed by GC-MS. Forty seven components amounting to 76.1% of the total oil were identified. The major constituents were α-cadinol (7.6%), β-selinene (6.4%), trans-verbenol (5.9%), caryophyllene oxide (5.7%), α-phellandren-8-ol (5.0%), verbenone (5.0%) and δ-cadinene (5.1%). The antimicrobial activity of the oil was tested against a panel of seventeen bacterial and six fungal strains by the disc diffusion method. The oil inhibited the growth of all test organisms at various levels; however, it showed significant inhibitory activity against Staphylococcus and Streptococcus species, as well as yeasts. The minimal inhibitory concentrations (MIC) were also determined.