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Eugenol alters the integrity of cell membrane and acts against the nosocomial pathogen Proteus mirabilis

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Abstract

Eugenol, a member of the phenylpropanoids class of chemical compounds, is a clear to pale yellow oily liquid extracted from certain essential oils especially from clove oil, nutmeg, cinnamon, and bay leaf. The antibacterial activity of eugenol and its mechanism of bactericidal action against Proteus mirabilis were evaluated. Treatment with eugenol at their minimum inhibitory concentration [0.125 % (v/v)] and minimum bactericidal concentration [0.25 % (v/v)] reduced the viability and resulted in complete inhibition of P. mirabilis. A strong bactericidal effect on P. mirabilis was also evident, as eugenol inactivated the bacterial population within 30 min exposure. Chemo-attractant property and the observance of highest antibacterial activity at alkaline pH suggest that eugenol can work more effectively when given in vivo. Eugenol inhibits the virulence factors produced by P. mirabilis as observed by swimming motility, swarming behavior and urease activity. It interacts with cellular membrane of P. mirabilis and makes it highly permeable, forming nonspecific pores on plasma membrane, which in turn directs the release of 260 nm absorbing materials and uptake of more crystal violet from the medium into the cells. SDS–polyacrylamide gel, scanning electron microscopy and Fourier transform infrared analysis further proves the disruptive action of eugenol on the plasma membrane of P. mirabilis. The findings reveal that eugenol shows an excellent bactericidal activity against P. mirabilis by altering the integrity of cell membrane.

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Acknowledgments

K.P.D. wishes to thank UGC, India for the financial support. The authors gratefully acknowledge the computational and bioinformatics facility provided by the Alagappa University Bioinformatics Infrastructure Facility (funded by Department of Biotechnology, Government of India; Grant No. BT/BI/25/001/2006).

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Authors and Affiliations

  1. Department of Biotechnology, Alagappa University, Karaikudi, 630003, Tamil Nadu, India

    K. Pandima Devi, R. Sakthivel, S. Arif Nisha, N. Suganthy & S. Karutha Pandian

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  1. K. Pandima Devi
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  2. R. Sakthivel
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  3. S. Arif Nisha
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  4. N. Suganthy
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  5. S. Karutha Pandian
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Correspondence to K. Pandima Devi.

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Devi, K.P., Sakthivel, R., Nisha, S.A. et al. Eugenol alters the integrity of cell membrane and acts against the nosocomial pathogen Proteus mirabilis . Arch. Pharm. Res. 36, 282–292 (2013). https://doi.org/10.1007/s12272-013-0028-3

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  • DOI: https://doi.org/10.1007/s12272-013-0028-3

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