Author(s): Perez-Lavalle, L ; Anabela Borges ; Gomes, IB ; Carrasco, E ; Valero, A ; Simoes, M ; Simões M ; Inês Gomes
Date: 2025
Persistent ID: https://hdl.handle.net/10216/167085
Origin: Repositório Aberto da Universidade do Porto
Subject(s): Engenharia biológica, Ciências biológicas, Ciências da saúde; Biological engineering, Biological sciences, Health sciences
The ability of Salmonella enterica subsp. enterica to persist and form biofilms on different surfaces can constitute a source of food contamination, being an issue of global concern. The objective of this study was to understand the biofilm formation profile of 14 S. enterica strains among different serovars and sources and to evaluate the ability of essential oil (EO) components (carveol, citronellol, and citronellal) to disinfect the biofilms formed on stainless steel and polypropylene surfaces. All the strains were able to form biofilms with counts between 5.34 to 6.78 log CFU cm(-2). Then, the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of EO components were evaluated on two selected strains. All compounds inhibited the growth of Salmonella Typhimurium (strain 1; MIC = 800-1000 mu g ml(-1)) and Salmonella Enteritidis (strain 5; MIC = 400-1000 mu g ml(-1)) and only carveol showed bactericidal activity against strains 1 and 5 (MBC = 1200 mu g ml(-1)). Biofilms were exposed to the EO components at 10 x MIC for 30 min and polypropylene surfaces were more difficult to disinfect showing reductions between 0.9 and <1.2 log CFU cm(-2). In general, the S. enterica biofilms demonstrated a significant tolerance to disinfection, demonstrating their high degree of recalcitrance on food processing surfaces.
