Journal
LWT-FOOD SCIENCE AND TECHNOLOGY
Volume 134, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.lwt.2020.110210
Keywords
Listeria monocytogenes; Clove essential oil; Biofilm; Inhibition mechanism; Surface
Categories
Funding
- State Key Laboratory of Utilization of Woody Oil Resource [2019XK2002]
- National Natural Science Foundation of China [31972172]
- Natural Science Foundation of Jiangsu Province [BK20170070]
- Jiangsu Province Research Fund
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Listeria monocytogenes (L. monocytogenes) can adhere to biological or non-biological surfaces, including food processing equipment and storage containers. Subsequently, they can contaminate food by forming a biofilm, thereby causing serious food safety problems. In this project, the natural antibacterial agent clove essential oil (CEO) was selected to control L. monocytogenes biofilm, and the effect and mechanism of its action on the biofilm were explored in depth. TEM and CLSM observation results showed that CEO can destroy the dense membrane structure of the biofilm, thereby acting on the released free bacteria. Meanwhile, the study found that after CEO (2 Minimum biofilm inhibition concentration) treatment, the metabolic activity of the bacteria was reduced by 60.26%, and the secretion of extracellular polysaccharides and proteins was significantly inhibited. Besides, the CEO treatment can down-regulate the expression levels of the genes agrA, agrC, agrD, and prfA and up-regulate the expression level of the gene sigB, thereby regulating the formation of biofilms. Finally, CEO showed a significant removal effect on biofilms on different materials and vegetable surfaces.
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