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An Acad Bras Cienc. 2017 Jul-Sep;89(3):1907-1915. doi: 10.1590/0001-3765201720160652. Epub 2017 Jul 31.

Chemical composition, antioxidant and antibacterial activities of essential oils from leaves and flowers of Eugenia klotzschiana Berg (Myrtaceae).

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Instituto Federal de Ciência e Tecnologia Goiano, Campus Rio Verde, Av. Sul Goiana, s/n, Zona Rural, 75901-970 Rio Verde, GO, Brazil.
Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Av. Dr. Armando Salles Oliveira, 201, Parque Universitário, 14404-600 Franca, SP, Brazil.
Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, s/n, Trindade, 88040-900 Florianópolis, SC, Brazil.
Instituto Federal de Educação, Ciência e Tecnologia do Sul de Minas Gerais, Campus Pouso Alegre, Av. Maria da Conceição Santos, 900, Parque Real, 37550-000 Pouso Alegre, MG, Brazil.


Many essential oils (EOs) of different plant species possess interesting antimicrobial effects on buccal bacteria and antioxidant properties. Eugenia klotzschiana Berg (pêra-do-cerrado, in Portuguese) is a species of Myrtaceae with restricted distribution in the Cerrado. The essential oils were extracted through the hydrodistillation technique using a modified Clevenger apparatus (2 hours) and chemically characterized by GC-MS. The major compounds were α-copaene (10.6 %) found in oil from leaves in natura, β-bisabolene (17.4 %) in the essential oil from dry leaves and α-(E)-bergamotene (29.9 %) in oil from flowers. The antioxidant activity of essential oils showed similarities in both methods under analysis (DPPH and ABTS˙+) and the results suggested moderate to high antioxidant activity. The antibacterial activity was evaluated by determining minimum inhibitory concentrations (MICs), using the microdilution method. MIC values below 400 µg/mL were obtained against Streptococcus salivarius (200 µg/mL), S. mutans (50 µg/mL), S. mitis (200 µg/mL) and Prevotella nigrescens (50 µg/mL). This is the first report of the chemical composition and antibacterial and antioxidant activities of the essential oils of E. klotzschiana. These results suggest that E. klotzschiana, a Brazilian plant, provide initial evidence of a new and alternative source of substances with medicinal interest.

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