Listeria monocytogenes are pathogenic microorganisms and of particular concern in the poultry industry. They are frequently isolated from raw chicken products due to their ability to attach to a wide variety of food and food‐contact surfaces. The application of synthetic antimicrobial agents is often limited by potential emergence of antimicrobial resistance and regulations associated to organic poultry products. Development of natural antimicrobial agents controlling Listeria monocytogenes contamination and pathogenesis represent an alternative approach. This study screened a range of plant extracts (including those from cranberry, mangosteen, persimmon, and roselle) for their ability to affect five Listeria monocytogenes strains with respect to their bacterial surface hydrophobicity, auto‐aggregation, and attachment to cultured human colorectal cells. Results show that mangosteen extracts showed significant inhibitory effects on the attachment of Listeria monocytogenes to the cell line, potentially due to a high level of proanthocyanidin content. In addition, the plant extracts influenced bacterial auto‐aggregation (increase in most of the cases) by increasing bacterial surface hydrophobicity. These results may support future development of alternative antimicrobial agents controlling the contamination and pathogenesis of Listeria monocytogenes.
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