The aim of the present work is to compare the chemical composition, antibacterial and antifungal activity of two spontaneous species of lavender "Lavandula stoechas L." and "Lavandula dentata L." in Morocco. A phytochemical screening was performed on the aerial part of invested plants. The qualitative variation was revealed in the secondary metabolites of the species studied. Subsequently, the dosage of the crude organic extracts showed that the polyphenol content was higher in the methanol fraction, with an important yield in L. dentata. Also, the essential oils of the aerial part, obtained by hydrodistillation gave higher yields in L. dentata than L. pedunculata. Finally, tests of the antibacterial and antifungal activity of the essential oils of the two species were performed on four strains of bacterial pathogens (Staphylococcus aureus "Gram+," and Escherichia coli; Klebsiella pneumoniae and Proteus mirabilis which are Gram-), and three phytopathogenic fungi : Rhizopus stolonifer, Aspergillus brasiliensis and Penicillium expansum, The results obtained showed that the essential oil of L. dentata showed a strong antibacterial activity against the studied strains, particularly against S. aureus. While the antifungal activity revealed that L. pedunculata has a remarkable antifungal power against the fungi tested in comparison with L. dentata.

No abstract

Analysis of essential oil (EO) obtained from H. maroccana revealed that germanicol (17.8 %), β-pinene (14.6 %), α-guaiene (5.83 %), germacrene D (5.55 %), α-pinene (5.3 %) and δ-cadinene (5 %) were found to be the major components of this essential oil. Antimicrobial potential of H. maroccana oil in liquid and vapor phase against different bacterial strains (Staphylococcus aureus ATCC 6538, Bacillus subtilis ATCC 6633, Escherichia coli ATCC 8739, Salmonella abony NCTC 6017) and fungal strains (Alternaria sp., Pencillium expansum, Rhizopus stolonifer, Fusarium oxysporum f. sp. albedinisand Aspergillus brasiliensis ATCC 16404) was determined by the disc volatilization method and agar dilution method. The EO is considered moderately active against gram-negative strains (E. coli, S. abony), and those of gram-positive (S. aureus, B. subtilis). S. abony was the most sensitive bacteria, providing the lowest growth with an MIC equal to 0.156 mg mL -1 . However, the mycelium growth was totally inhibited in the presence of the vapor generated by 0.5 µl mL -1 air for Alternaria sp.

This work aimed to inventory the medicinal plants used in traditional medicine

No abstract