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The species Hyptis martiusii Benth. commonly called “cidreira do campo” has multiple biological properties, such as antifungal, anti-inflammatory, and insecticide. The aim of this study was to investigate the modulating activity of the essential oil of the fresh leaves of Hyptis martiusii in association with different antibiotics against the bacteria Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa, as also the cytotoxic activity of this species. Materials and methods: The study used the MIC (minimum inhibitory concentration) as a way of assessing the modulation using an inoculation of 100 microliters of each bacterial strain. The cytotoxicity tests were conducted using in vitro culture of mouse connective tissue cells (fibroblasts of mammals). Results: The research demonstrated that the essential oil from leaves of Hyptis martiusii Benth (oehm) presented synergism only when associated with the antibiotics gentamicin and imipenem against the bacteria Pseudomonas aeruginosa and Escherichia coli. However, it presented antagonism in association with amikacin, gentamicin and imipenem against the three studied bacteria. In addition to the ciprofloxacin showed no relevant results. In relation to the cytotoxic activity the lethal concentration (LC50) exhibited a value of 263.12 μg/ml. Conclusion: Ultimately it was established, that H. Martiusii presents a synergistic cytotoxic activity against the evaluated bacteria.

Avaliação da atividade moduladora e citotóxica do óleo essencial das folhas de Hyptis martiusii Benth