Bechlaghem, Karima2021-04-112021-04-112020-09-09salle des thèsesDOC547-62-01https://dspace.univ-tlemcen.dz/handle/112/16337: Huiles essentielles, CPG et CPG/SM, activité antioxydante,activité antimicrobienne, activité inhibitrice in vitro de l’α- amylase, activité insecticide.The laboratory of natural and bioactive substances (LASNABIO) of the University of Tlemcen has been interested for a decade in the extraction and characterization of bioactive molecules including essential oils known for their therapeutic virtues and their uses in several sectors. This work is a contribution to the valorization of some medicinal plants of North-West of Algeria. These are: Cistus ladaniferus, Cistus albidus and Cistus monspeliensis. The investigation of these species was conducted by a rational scientific study aimed the chemical analysis of the essential oils of the aerial part of the three species and subsequently valorize the aromatic extract by a biological study .The results obtained are promising for the use of these species as antimicrobial agents, antioxidants, antidiabetics and as biopesticides.frEssential oils, GC and GC / MS, antioxidant activity, antimicrobial activity, in vitro α-amylase inhibitory activity, insecticidal activityThesis