Antimicrobial synergism and antibiofilm activities of Pelargonium graveolens, Rosemary officinalis, and Mentha piperita essential oils against extreme drug-resistant Acinetobacter baumannii clinical isolates
Abstract
Rosemary officinalis L., Pelargonium graveolens L., and Mentha piperita L., essential oils are used by complementary medicine specialists simultaneously with traditional antibiotics for treatment purposes. The chemical composition of essential oils was analyzed by the gas chromatography-mass spectrometry method. In vitro antibacterial and antibiofilm activities of the essential oils were tested against extreme drug-resistant (XDR) colistin-resistant and colistin susceptible Acinetobacter baumannii clinical strains. The synergistic activities between essential oils and colistin antibiotics were investigated by the checkerboard method. The highest antibacterial effect was detected in mint essential oil (2.5–5 μl/ml), followed by pelargonium essential oil (5–20 μl/ml) and rosemary essential oil (5–20 μl/ml). The combination of rosemary essential oil or pelargonium essential oil with colistin showed strong synergistic activity in most of the bacterial strains tested (fractional inhibitory concentration index ≤ 0.5; synergy). As a result of the combination of mint essential oil and colistin, an indifferent effect was observed in only two bacterial strains, and other strains could not be evaluated. No antagonistic effects were observed in any of the tested essential oils. As a result of the effectiveness of the combination, the minimum inhibitory concentration (MIC) values of colistin in XDR-A. baumannii clinical isolates decreased 2–32 fold. Additionally, the sub-MIC concentration of essential oils exhibited an inhibitory effect (48–90%) against the biofilm layer of tested A. baumannii strains.
Acknowledgment
We would like to thank the Cosmer Kimya company for supporting us in supplying the essential oils that we use in our study.
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Author Contributions: A.H. Taskin Kafa participated in the design of research, conducting the experiments, analyzing the data, and drafting and commentating the manuscript. R. Aslan contributed to conducting the assays, analyzing the data, and writing the manuscript. C. Celik supervised the whole research and contributed to the continuity of assay studies. M. Hasbek contributed to the supply and preparation of bacteria, studied. All the authors have read the final manuscript and approved it.
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Research funding: None declared.
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Conflict of Interest Statement: No conflict of interest was declared by the authors.
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Supplementary material
The online version of this article offers supplementary material (https://doi.org/10.1515/znc-2021-0079).
© 2021 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
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Articles in the same Issue
- Frontmatter
- Research Articles
- Bioactive compounds from Matricaria chamomilla: structure identification, in vitro antiproliferative, antimigratory, antiangiogenic, and antiadenoviral activities
- Antimicrobial synergism and antibiofilm activities of Pelargonium graveolens, Rosemary officinalis, and Mentha piperita essential oils against extreme drug-resistant Acinetobacter baumannii clinical isolates
- Chemical composition, antioxidant, and antimicrobial activities of two essential oils from Algerian propolis
- Stability of proteins involved in initiation of DNA replication in UV damaged human cells
- Bioguided isolation of antiplasmodial secondary metabolites from Persea americana Mill. (Lauraceae)
- Biological activities of some Salvia species
- Secondary metabolites of downy birch buds (Betula pubescens Erch.)
- (−)-Brunneusine, a new phenolic compound with antibacterial properties in aqueous medium from the leaves of Agelanthus brunneus (Engl.) Tiegh (LORANTHACEAE)
- Novel thiazolyl-hydrazone derivatives including piperazine ring: synthesis, in vitro evaluation, and molecular docking as selective MAO-A inhibitor