BOUGUELMOUNA, Fatima2023-04-052023-04-052014https://dspace.univ-ghardaia.edu.dz/xmlui/handle/123456789/5952This study is focused on the extraction of essential oils from three medicinal and aromatic plants Mentha pulegium L , Apium graveolens and Pelargonium graveolens was performed by the method of hydrodistilation ., Test of the antibacterial activity of these plants thus the 4 bacterial strains. Our study leaves appear: the yields of essential oils of Mentha pulegium L(0.25 %) and pelargonium graveolens (0.15%), the essential oils of Pelargonium graveolens have strong antibacterial activity (36 ±0.816 mm) from the Mentha pulegiumL (19 ±0 mm) in Escherichia coli., Enterobacter cloacae., Staphylococcus aureus and Pseudomonas aerogenosa, and hydrosols our plants, an average efficiency observed compared to the essential oils.frMedicinal and Aromatic Plants, Hydrodistilation , Antibacterial Activity , Essential Oils and HydrosolsPlantes Médicinales et Aromatiques, Hydrodistilation, Activité antibactérienne, Huiles essentielles et Hydrolats