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This study was designed to determine the chemical composition, antioxidant, antimicrobial and insecticidal activities of essential oils of  Thymus guyonii  and  Thymus algeriensis . The essential oils (EOs) were isolated by hydrodistillation and analyzed by GC and GC-MS. The leading components of the oils were p-cymene (15.8%), γ-terpinene (15.3%), thymol methyl ether (15.7%) and thymol (19.1%) for  T. guyonii  and α-pinene (4.4%), camphor (4.6%), bornyl acetate (5.4%) and terpinenyl actate (28.1%) for  T. algeriensis . The antioxidant activity was evaluated in terms of scavenging of free radicals DPPH ●  and ABTS ●+ . The essential oil of  T. guyonii  was the most efficient in inhibiting free radicals but less active compared to synthetic antioxidants (Trolox and BHT). Also,  T. guyonii  essential oil showed the highest effectiveness against the rice weevil,  Sitophilus oryzae  L. (Coleoptera: Curculionidae) as well as against five microorganisms, two gram-positive ( Staphylococcus aureus  and  Bacillus subtilis ), one gram-negative ( Escherichia coli ), one yeast ( Candida albicans ) and one fungus ( Aspergillus brasiliensis ). The results suggest that the EO of  T. guyonii  could be considered in pharmaceutical and food fields as well as for preservation of stored products from  S. oryzae  damage.

journal of essential oil bearing plants

Chemical Constituents, Antioxidant, Antimicrobial and Insecticidal Activities of the Essential Oils Extracted from  Thymus guyonii  de Noé and  Thymus algeriensis  Boiss. et Reut.