antibiotics Article Antimicrobial Activity of Extracts of Two Native Fruits of Chile: Arrayan (Luma apiculata) and Peumo (Cryptocarya alba) Jitka Viktorová 1, Rohitesh Kumar 1, Kateˇrina Rehoˇrovˇ á 1, Lan Hoang 1 , Tomas Ruml 1 , Carlos R. Figueroa 2 , Monika Valdenegro 3 and Lida Fuentes 4,* 1 Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, 166 28 Prague, Czech Republic;
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[email protected] Received: 22 June 2020; Accepted: 21 July 2020; Published: 25 July 2020 Abstract: Arrayan and peumo fruits are commonly used in the traditional medicine of Chile. In this study, the concentration of the extracts halving the bacterial viability and biofilms formation and disruption of the drug-sensitive and drug-resistant strains of Staphylococcus aureus and Pseudomonas aeruginosa was determined. The chemical composition of extracts was analyzed by high-resolution liquid chromatography coupled with mass spectrometry (U-HPLC/MS). The arrayan extract (Inhibitory concentration IC 0.35 0.01 mg/mL) was more effective than peumo extract (IC 0.53 0.02 mg/mL) 50 ± 50 ± in the inhibition of S.