Evaluation of Different Chemotypes of Lavandula angustifolia Essential Oils as Phytobiotics for the Control of Clinical Escherichia coli Strains Isolated from Commercial Poultry Production
- 1Department of Monogastric Animal Sciences, Faculty of Biotechnology and Animal Sciences, West Pomeranian University of Technology in Szczecin, Janickiego St. 29, 71-270 Szczecin, Poland
- 2Department of Organic Chemical Technology and Polymer Materials, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Piastów Ave. 42, 71-065 Szczecin, Poland
- 3Department of Microbiology and Biotechnology, Faculty of Biotechnology and Animal Sciences, West Pomeranian University of Technology in Szczecin, Piastów Ave. 45, 70-310 Szczecin, Poland
Abstract
The study focused on evaluating the antibacterial activity of ten essential oils (EOs) representing different origins and chemotypes of common lavender (Lavandula angustifolia), as well as their two major constituents, linalool and linalyl acetate. The aim of the study was to evaluate their potential as natural phytobiotics against clinical Escherichia coli strains isolated from poultry, including multidrug-resistant avian pathogenic E. coli as well as the reference strain ATCC 25922. GC-MS analysis demonstrated variation in the chemical composition of the EOs, with linalool (16.00–35.95%) and linalyl acetate (18.15–43.61%) identified as the major constituents. Determination of the minimum inhibitory concentration (MIC) by the broth microdilution method showed that pure linalool exhibited the strongest antibacterial activity (mean MIC = 0.31% v/v), followed by the EO from the lavender variety ‘Blue River’ (0.85% v/v), and the varieties ‘Maillette’ and ‘Ellagance Purple’ (0.98% and 1.00% v/v, respectively). Linalyl acetate had 5-fold lower antibacterial activity than linalool (1.63% v/v), whereas the weakest activity was observed for the variety ‘Matherone’ EO (4.50% v/v). Statistical analysis confirmed a significant correlation between higher linalool content and stronger antibacterial activity of the tested EOs against various strains of E. coli. Time–kill analysis showed that linalool and EOs with high linalool levels completely eliminated the multidrug-resistant E. coli strain within 4–8 h. EOs from L. angustifolia show potential as an alternative to conventional antibiotics in poultry production but their efficacy is highly dependent on the chemotype.
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BibTeX
@article{adaszynskaskwirzynska2026evaluation,
title = {{Evaluation of Different Chemotypes of Lavandula angustifolia Essential Oils as Phytobiotics for the Control of Clinical Escherichia coli Strains Isolated from Commercial Poultry Production}},
author = {Michalina Adaszyńska-Skwirzyńska and Małgorzata Dzięcioł and Sławomir Zych},
journal = {Molecules (Basel, Switzerland)},
year = {2026},
month = oct,
doi = {10.3390/molecules31193495},
url = {https://europepmc.org/article/PMC/PMC13666156},
note = {CC BY},
}
RIS
TY - JOUR
TI - Evaluation of Different Chemotypes of Lavandula angustifolia Essential Oils as Phytobiotics for the Control of Clinical Escherichia coli Strains Isolated from Commercial Poultry Production
AU - Michalina Adaszyńska-Skwirzyńska
AU - Małgorzata Dzięcioł
AU - Sławomir Zych
PY - 2026
DA - 2026/10/01
JO - Molecules (Basel, Switzerland)
DO - 10.3390/molecules31193495
UR - https://europepmc.org/article/PMC/PMC13666156
AB - The study focused on evaluating the antibacterial activity of ten essential oils (EOs) representing different origins and chemotypes of common lavender (Lavandula angustifolia), as well as their two major constituents, linalool and linalyl acetate. The aim of the study was to evaluate their potential as natural phytobiotics against clinical Escherichia coli strains isolated from poultry, including multidrug-resistant avian pathogenic E. coli as well as the reference strain ATCC 25922. GC-MS analysis demonstrated variation in the chemical composition of the EOs, with linalool (16.00–35.95%) and linalyl acetate (18.15–43.61%) identified as the major constituents. Determination of the minimum inhibitory concentration (MIC) by the broth microdilution method showed that pure linalool exhibited the strongest antibacterial activity (mean MIC = 0.31% v/v), followed by the EO from the lavender variety ‘Blue River’ (0.85% v/v), and the varieties ‘Maillette’ and ‘Ellagance Purple’ (0.98% and 1.00% v/v, respectively). Linalyl acetate had 5-fold lower antibacterial activity than linalool (1.63% v/v), whereas the weakest activity was observed for the variety ‘Matherone’ EO (4.50% v/v). Statistical analysis confirmed a significant correlation between higher linalool content and stronger antibacterial activity of the tested EOs against various strains of E. coli. Time–kill analysis showed that linalool and EOs with high linalool levels completely eliminated the multidrug-resistant E. coli strain within 4–8 h. EOs from L. angustifolia show potential as an alternative to conventional antibiotics in poultry production but their efficacy is highly dependent on the chemotype.
SN - 1420-3049
ER -