Antioxidant, Antimicrobial and Anti-Quorum Sensing Activities of Usnea filipendula and Viscum album

Many plants contain a variety of bioactive components. Therefore, it is important to know the bioactive properties of plantmaterials in order to be a reference for later researchers. In this study, it was investigated the antioxidant, antimicrobial and anti-quorum sensingactivities of Usnea filipendula and Viscum album’s methanol extracts. To determine the antioxidant properties of the extracts; total phenolic,flavonoid and condensed tannin contents and ferric reducing antioxidant power analyses were performed. The antibacterial potential of plantextracts was tested by agar well diffusion method against Staphylococcus aureus, Escherichia coli, Enterococcus faecalis, Pseudomonasaeruginosa, Salmonella typhimurium, Klebsiella pneumoniae, Proteus mirabilis, Listeria monocytogenes, Candida parapsilosis and Candidaalbicans microorganisms. Anti-quorum sensing activity was investigated on Chromobacterium violaceum bacteria. The highest total phenolicand ferric reducing antioxidant power was determined in U. filipendula extract. This extract inhibited the growth of S. aureus, K. pneumonia andL. monocytogenes microorganisms. The highest flavonoid and condensed tannin was observed in V. album extract. This extract was also able toprevent the growth of K. pneumonia and L. monocytogenes. None of the extracts showed anti-quorum sensing activity.