Phenolic profile and biological properties of the leaves of Ficus vasta Forssk. (Moraceae) growing in Egypt

Résumé

Ficus vasta Forssk. (Moraceae) is traditionally used for the treatment of various ailments; nonetheless, this species has been poorly studied to date. This work aimed to characterize the phenolic profile and to evaluate the antioxidant and antimicrobial properties of a hydroalcoholic extract obtained from F. vasta leaves collected in Egypt. The phenolic profile of the extract was characterized by HPLC-PDA/ESI-MS. The antioxidant properties were examined by different in vitro systems: DPPH test, reducing power and metal chelating activity assays. Moreover, the ability of the extract to protect Escherichia coli growth and survival from H 2 O 2 -induced oxidative stress was evaluated. The potential toxicity was investigated using Artemia salina lethality bioassay. Finally, the antimicrobial properties against a representative set of Gram-positive and Gram-negative bacterial strains and the yeast C. albicans were assayed by standard methods. By HPLC-PDA/ESI-MS analysis 12 compounds belonging to the groups of phenolic acids and flavonoids were identified. The extract exhibited strong radical scavenging activity in DPPH test (IC 50 = 0.0672 ± 0.0038 mg/mL), reducing power (3.65 ± 0.48 ASE/mL) and chelating activity (IC 50 = 0.801 ± 0.007 mg/mL). A total protection against H 2 O 2 -induced damage on E. coli was observed. No toxicity against A. salina was found (LC 50 > 1000 μg/mL). The extract exhibited bacteriostatic activity against almost all the bacteria tested (MICs: 250–62.5 μg/mL). The obtained results demonstrate the potential of F. vasta leaves as safe sources of natural antioxidant and antimicrobial compounds.

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