Objective:

to evaluate the in-vitro antifungal and antibacterial activity of the ethanolic extract of Usnea laevis against Candida albicans, Staphylococcus aureus and Pseudomonas aeruginosa.

Methods:

lichened substances present in Usnea laevis were extracted using the Soxhlet methods and were analyzed by chromatography coupled to mass spectrometry. The Kirby-Bauer method was used to evaluate both the antibacterial and antifungal activity.

Results:

Usnic acid, eugenol, and ergosterol were the compounds found. S. aureus was sensitive at a concentration of 27 mg/ml of the enolic extract, the 11 mg/ml concentration was not effective.

Conclusions:

The ethanolic extract of Usnea laevis has antibacterial and antifungal properties against the pathogens tested.

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