Leonotis nepetifolia é uma planta popularmente conhecida como "cordão-de-frade" e pertence à família Lamiaceae. Originário da África e naturalizado no estado do Rio Grande do Sul, é utilizado na medicina popular e ayurvédica para o tratamento de diversas doenças como infecções de pele, reumatismo, tosse, dores de estômago, sedativos e outros. Diante disso, justifica-se a escolha desta planta como alvo deste estudo. O objetivo deste trabalho foi obter extrato bruto (EBFoLn), n-hexano (FHFoLn) e frações de acetato de etila (FAFoLn) de folhas de L. nepetifolia, para realizar a análise fitoquímica e avaliação in vitro de antibacteriano e antioxidante. atividades de extrato e frações. O extrato bruto (rendimento de 15%) foi obtido por maceração em metanol por 7 dias, sendo evaporado à secura e fracionado com n-hexano e acetato de etila para obtenção de FHFoLn e
Leonotis nepetifolia (L.) R. Br. (Lamiaceae) is a naturalized medicinal plant in Brazil known as 'cordão-de-frade', being used in folk medicine for the treatment of a variety of conditions such as infections and inflammations. L. nepetifolia leaf and flower essential oils were isolated by hydrodistillation, and their compounds were identified by GC-MS analysis. The leaf essential oil major constituents were germacrene D (31.5%), and β-caryophyllene (19.2%), while in flower essential oil the main constituents were β-elemene (31.2%), and germacrene D (12.1%). The essential oils were investigated against a broad spectrum of bacteria and fungi using the microdilution method, exhibiting MIC50 values of 3.93-250 µg mL -1 .Both oils showed excellent antifungal properties, which is a very important finding since most fungi have shown increased resistance to known antifungal agents.According to these results, the essential oils of L. nepetifolia are promising sources of new antimicrobial agents, especially for yeast.
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