Antimicrobial, anti-enzymatic and antioxidant activities of essential oils from some Tunisian E species.

Many plants can produce essential oils (EOs), having various biological properties. This study evaluated the antioxidant, anti-enzymatic and antimicrobial effects of the EOs derived from leaves of and . The antioxidant activity of the EOs was carried out with three different methods (ABTS, DPPH and FRAP). In addition, their anti-colinesterases, anti α-amylase and anti α-glucosidase effects were assessed by spectrophotometric assays. The antimicrobial activities were tested against six phytopathogenic bacterial strains, including two G + ve ( and ) and four G-ve (, , and ). The current study has also investigated the inhibition of biofilm formation and the possible effect on bacterial cells biofilm metabolism of three Gram-negative (, and ) and two Gram-positive pathogenic bacteria ( and ). The ABTS and DPPH tests indicated that and EOs showed high antioxidant activities, whereas FRAP test suggested that EO exhibited the better antioxidant activity. and EOs were the most active against cholinesterases instead and EOs were more active against enzymes involved in diabetes. Antibacterial assays revealed that and EOs possess significant activity closely to tetracycline. Whereas, the antifungal assay revealed that all EOs have effectively suppressed the tested fungal growth. EO showed substantial efficacy inhibiting both the mature biofilm (85.40 %) and metabolic activities (89.80 %) of These results demonstrate the wide range of possible uses for EOs in both agriculture and medicine fields, suggesting potential uses as strong antibiofilm agents and for biocontrol of phytopathogens.