Comparative inhibitory effects of Thymus vulgaris L. essential oil against Staphylococcus aureus, Listeria monocytogenes and mesophilic starter co-culture in cheese-mimicking models

Food Microbiology
Rayssa Julliane de CarvalhoEvandro Leite de Souza

Abstract

In the present study, we assessed the effects of Thymus vulgaris L. essential oil (TVEO) on Staphylococcus aureus and Listeria monocytogenes, pathogenic bacteria frequently associated with fresh or low-ripened cheeses (e.g., Brazilian coalho cheese), and on a starter co-culture comprising Lactococcus lactis subsp. lactis and L. lactis subsp. cremoris, which are commonly used for the production of different cheeses. To measure these effects, we determined the minimum inhibitory concentration (MIC) and assessed bacterial cell viability over time in (coalho) cheese-based broth and in a semi-solid (coalho) cheese model at 10 °C. The MIC for TVEO was 2.5 μL/mL against S. aureus and L. monocytogenes, while the MIC was 1.25 μL/mL against the starter co-culture. The TVEO (5 and 2.5 μL/mL) sharply reduced the viable counts of all assayed bacteria in cheese broth over 24 h; although, at 5 μL/mL, TVEO more severely affected the viability of the starter co-culture compared with pathogenic bacteria. The addition of 1.25 μL/g of TVEO in the semi-solid cheese model did not reduce the viable counts of all assayed bacteria. At 2.5 μL/g, TVEO slightly decreased the viable counts of S. aureus, L. monocytogenes and Lactococcus spp. in the semi-sol...Continue Reading

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Citations

Jan 11, 2017·Food Science and Technology International = Ciencia Y Tecnología De Los Alimentos Internacional·Carla María Blanco-LizarazoIndira Sotelo-Díaz
Jun 13, 2017·Journal of Food Protection·Valdenice Gomes de AraújoEvandro Leite de Souza
Jan 18, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ersilia AlexaCristina Dehelean
Sep 27, 2019·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Robenilson Ferreira Dos SantosMaria Tereza de Araujo
Sep 1, 2019·Comprehensive Reviews in Food Science and Food Safety·Bruna A KamimuraAnderson S Sant'Ana
Apr 4, 2021·International Journal of Environmental Research and Public Health·Juan García-Díez, Cristina Saraiva
Mar 12, 2020·Food Research International·Coralie DupasEmilie Dumas
Jun 22, 2018·International Journal of Biological Macromolecules·Francine Tavares da SilvaAlvaro Renato Guerra Dias

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