Synergistic action between Caryocar coriaceum Wittm. fixed oil with aminoglycosides in vitro

Authors

  • Rogério A. Saraiva,

    1. Laboratório de Bioquimica Toxicológica, Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
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  • Edinardo F. F. Matias,

    1. Laboratório de Microbiologia e Biologia Molecular, LMBM, Departamento de Química Biológica, Universidade Regional do Cariri, Crato, CE, Brazil
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  • Henrique D. M. Coutinho,

    Corresponding author
    1. Laboratório de Microbiologia e Biologia Molecular, LMBM, Departamento de Química Biológica, Universidade Regional do Cariri, Crato, CE, Brazil
    • Departamento de Química Biológica, Universidade Regional do Cariri – URCA, Rua Cel. Antonio Luis 1161, Pimenta 63105-000, Crato, CE, Brazil Fax: +55 88 31021291
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  • José G. M. Costa,

    1. Laboratório de Pesquisa em Produtos Naturais, LPPN, Departamento de Química Biológica, Universidade Regional do Cariri, Crato, CE, Brazil
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  • Heloísa Helena F. Souza,

    1. Laboratório de Farmacologia e Química Molecular, Departamento de Química Biológica, Universidade Regional do Cariri, Crato, CE, Brazil
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  • Cícera Norma Fernandes,

    1. Laboratório de Farmacologia e Química Molecular, Departamento de Química Biológica, Universidade Regional do Cariri, Crato, CE, Brazil
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  • João B. T. Rocha,

    1. Laboratório de Bioquimica Toxicológica, Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
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  • Irwin R. A. Menezes

    1. Laboratório de Farmacologia e Química Molecular, Departamento de Química Biológica, Universidade Regional do Cariri, Crato, CE, Brazil
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Abstract

The oil obtained from the Caryocar coriaceum Wittm. (pequi) fruit pulp (C. coriaceum fixed oil – CCFO), rich in fatty acids, has been secularly employed by traditional medicine in the treatment of respiratory affections, skin inflammation, and wounds. These observations encouraged us to investigate the antimicrobial activity of CCFO and to investigate its effect in combination with aminoglycosides. The minimum inhibitory concentration (MIC) of CCFO alone and associated with aminoglycosides against Escherichia coli and Staphylococcus aureus strains were determined using microdilution assay. CCFO alone had a MIC of 512 µg/mL against E. coli and S. aureus resistant strains. Combining the CCFO with aminoglycosides reduced the MIC of aminoglycosides against the resistant strains of E. coli and S. aureus. The results obtained indicate that CCFO displays a significant synergistic antibiotic effect when combined with aminoglycosides, demonstrating that the oil constituents (fatty acids) may act as potentiators of the antibiotic activity of aminoglycosides. These properties make CCFO oil an interesting alternative as a remedy or nutraceutical against multiresistant bacteria, preventing the development of resistance by these microorganisms.

Practical applications: This article demonstrates the capacity of the C. coriaceum oil to enhance the antibiotic activity of aminoglycosides. This activity could represent a new way to combat the growing bacterial resistance to antibiotics, an important problem of public health.

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