Evaluation of the antibacterial activity of bergamot essential oils on different Listeria monocytogenes strains

Submitted: 19 July 2016
Accepted: 22 September 2016
Published: 1 December 2016
Abstract Views: 2517
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Essential oils are aromatic and volatile substances extracted from plants and characterized by antimicrobial activity. The aim of the present study was to evaluate the antibacterial activity (agar disc-diffusion method) of seven different bergamot essential oils (BEOs) on eight Listeria monocytogenes strains. Minimal inhibitory concentration (MIC) of most efficient BEOs was estimated. Extremely variable results for agar disc-diffusion method for L. monocytogenes strains were reported. One of the tested microorganisms resulted insensible to all the BEOs; 3 strains showed an inhibition from weak to null and the remaining 4 a variable susceptibility. Among the BEOs tested, one showed a strong activity against four pathogenic strains. Four BEOs revealed weak, moderate or null activity in all the 7 sensitive strains, while for two oils only a weak or no activity was reported. MIC values were 0.625 μL/mL for the most efficient BEO, 2.5 and 5 μL/mL for the other samples that showed moderate inhibition. Experiment results are significantly related to the strains tested (P<0.01), rather than the BEO employed (P>0.01). In conclusion, we can consider BEO as a natural technological hurdle for Listeria monocytogenes in combination with other preservation strategies. Finally, this study underlines the necessity to evaluate the antimicrobial activity of EOs on a significant strains number of the same bacteria.

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Marotta SM, Giarratana F, Parco A, Neri D, Ziino G, Giuffrida A, Panebianco A. Evaluation of the antibacterial activity of bergamot essential oils on different Listeria monocytogenes strains. Ital J Food Safety [Internet]. 2016 Dec. 1 [cited 2024 Jul. 13];5(4). Available from: https://www.pagepressjournals.org/ijfs/article/view/6176

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