<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The different varieties of cheese are fermented dairy products with high nutritional value, which have been part of the healthy human diet for centuries. Cheeses are characterized by complex and diverse microbiota carrying beneficial, spoilage, or foodborne pathogen bacteria. Harmful bacteria originate from the production chain. Identification and characterization of microorganisms in cheese are important nutritional, food safety, and technological issues. During this study, <italic>Citrobacter braakii</italic> EC-PS1 and <italic>Macrococcus caseolyticus</italic> Li-PT1 bacteria strains, isolated on selective mediums from two artisanal cheeses, were identified by way of 16S rDNA gene sequence analysis. Their antibiotic resistance and NaCl stress tolerance were also determined <italic>M. caseolyticus</italic> Li-PT1 showed tolerance to 6.5% and 10% NaCl. The increasing NaCl concentration above 15% contributed to the decrease of viability in bacteria. The increasing NaCl concentration to 10% contributed to the decrease of viability in <italic>C. braakii</italic> EC-PS1 bacteria. The identified bacterial species exhibited different levels of resistance to the tested antibiotics <italic>C. braakii</italic> EC-PS1 showed resistance to chloramphenicol, ampicillin, and streptomycin, whereas <italic>M. caseolyticus</italic> Li-PT1 was susceptible only to two antibiotics (erythromycin, tetracycline) out of the eight tested.</p>
</abstract>

The different varieties of cheese are fermented dairy products with high nutritional value, which have been part of the healthy human diet for centuries. Cheeses are characterized by complex and diverse microbiota carrying beneficial, spoilage, or foodborne pathogen bacteria. Harmful bacteria originate from the production chain. Identification and characterization of microorganisms in cheese are important nutritional, food safety, and technological issues. During this study, Citrobacter braakii EC-PS1 and Macrococcus caseolyticus Li-PT1 bacteria strains, isolated on selective mediums from two artisanal cheeses, were identified by way of 16S rDNA gene sequence analysis. Their antibiotic resistance and NaCl stress tolerance were also determined M. caseolyticus Li-PT1 showed tolerance to 6.5% and 10% NaCl. The increasing NaCl concentration above 15% contributed to the decrease of viability in bacteria. The increasing NaCl concentration to 10% contributed to the decrease of viability in C. braakii EC-PS1 bacteria. The identified bacterial species exhibited different levels of resistance to the tested antibiotics C. braakii EC-PS1 showed resistance to chloramphenicol, ampicillin, and streptomycin, whereas M. caseolyticus Li-PT1 was susceptible only to two antibiotics (erythromycin, tetracycline) out of the eight tested.

Assessment of sodium chloride tolerance and antibiotic resistance of <italic>Citrobacter braakii</italic> EC-PS1 and <italic>Macrococcus caseolyticus</italic> Li-PT1 isolated from artisanal cheeses

Sapientia Hungarian University of Transylvania

Faculty of Economics, Socio-Human Sciences and Engineering, Department of Food Science

Acta Universitatis Sapientiae, Alimentaria

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Assessment of sodium chloride tolerance and antibiotic resistance of  EC-PS1 and  Li-PT1 isolated from artisanal cheeses

The different varieties of cheese are fermented dairy products with high nutritional value, which have been part of the healthy human diet for centuries....

Assessment of sodium chloride tolerance and antibiotic resistance of Citrobacter braakii EC-PS1 and Macrococcus caseolyticus Li-PT1 isolated from artisanal cheeses

Publié en ligne: 05 janv. 2023

Pages: 94 - 107

DOI: https://doi.org/10.2478/ausal-2022-0008

Mots clés
osmotic stress, antibiotic resistance, cheese, food safety

© 2022 É. György et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Assessment of sodium chloride tolerance and antibiotic resistance of Citrobacter braakii EC-PS1 and Macrococcus caseolyticus Li-PT1 isolated from artisanal cheeses

Publié en ligne: 05 janv. 2023

Pages: 94 - 107

DOI: https://doi.org/10.2478/ausal-2022-0008

Mots clésosmotic stress, antibiotic resistance, cheese, food safety

© 2022 É. György et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Mots clés
osmotic stress, antibiotic resistance, cheese, food safety