Evaluation of the Antimicrobial and Antivirulent Potential of Essential Oils Isolated from Juniperus oxycedrus L. ssp. macrocarpa Aerial Parts
Gabriella Spengler; Márió Gajdács; Matthew Gavino Donadu; Marianna Usai; Mauro Marchetti; Marco Ferrari; Vittorio Mazzarello; Stefania Zanetti; Fruzsina Nagy; Renátó Kovács
As a consequence of the worsening situation with multidrug-resistant (MDR) pathogens and a disparity in the commercialization of novel antimicrobial agents, scientists have been prompted to seek out new compounds with antimicrobial activity from a wide range of sources, including medicinal plants. In the present study, the antibacterial, antifungal, anti-virulence, and resistance-modulating properties of the essential oil from the Sardinian endemic Juniperus oxycedrus L. ssp. macrocarpa aerial parts were evaluated. The GC/MS analysis showed that the main compounds in the oil were &alpha:-pinene (56.63 ±: 0.24%), limonene (14.66 ±: 0.11%), and &beta:-pinene (13.42 ±: 0.09%). The essential oil showed potent antibacterial activity against Gram-positive bacteria (0.25&ndash:2 v/v%) and Salmonella spp. (4 v/v%). The strongest fungicidal activity was recorded against Candida auris sessile cells (median FICI was 0.088) but not against C. albicans biofilms (median FICI was 1). The oil showed potent efflux pump inhibitory properties in the case of Staphylococcus aureus and Escherichia coli. The therapeutic potential of Juniperus may be promising for future more extensive research and in vivo tests to develop new drugs against antibiotic and antifungal resistance.
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