Background: Avicennia schaueriana Stapf & Leechm. ex Moldenke (Acanthaceae) is\na native species from the Brazilian mangroves presenting ecological and economic significance.\nThis study compared the composition and the biological activities from the essential oils obtained from\ntwo A. schaueriana populations collected at Jureia-Itatins and Ilha do Cardoso. Methods: Essential oils\nwere obtained by conventional means, and their compositions were analyzed by GC-MS. Screening\nassays for antimicrobial activity were carried out by the microdilution method and the antioxidant\npotential was assessed by the DPPH scavenging method. Results: The GC-MS analysis indicated\nthat the Jureia oil (1) was composed mostly of the fatty acids palmitic (46.5%) and myristic (11.6%)\nacids, while the main components for the Ilha do Cardoso oil (2) were eugenol (19.7%), eugenol\nacetate (12.9%) and palmitic acid (15.1%). The oils showed an IC50 of 0.9 �± 0.011 mg/mL for 1 and\n1.13 �± 0.028 mg/mL for 2 in the DPPH assay. The antimicrobial assay indicated MIC > 217 �¼g/mL\nfor all tested microorganisms. Conclusions: The different essential oil composition may indicate the\npresence of chemotypes for A. schaueriana. The antioxidant activity of the oils was weak if compared\nwith flavonoids. Despite the high MIC values, these oils presented some antibacterial potential\nagainst Pseudomonas aeruginosa.
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