The in vitro antibacterial and α-amylase inhibitiory activities of the essential oils isolated from five Lamiaceae species (Thymus capitatus, Thymus algeriensis, Lavandula. stoechas, Lavandula multifida, Rosmrinus officinalis var. typicus, and var. troglodytorum), were evaluated.

Antibacterial effects of essential oils have been studied against seven strains (Staphylococcus aureus, Streptococcus feacalis, Bacillus cereus, Staphylococcus epidermis (Gram-positive), and Pseudomonas aeruginosa, Escherichia coli, and Klebsiella pneumonia (Gram-negative).

The highest antibacterial activity was recorded for T. capitattus oil. The Results indicate a high variation of MIC and MBCs among tested species. T. capitatus sample showed the best bacteriostatic and bactericidal activities (MIC=0.05-0.1 µl/ml, MBC=0.125-0.5 µl/ml). The uppermost α-amylase inhibitiory capacity was also observed by T. capitatus essential oil, rich in carvacrol.