Isolation and Characterization of Enterococci Bacteriocinic Strains from Tunisian Fish Viscera — Oak Academic Publishing
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Isolation and Characterization of Enterococci Bacteriocinic Strains from Tunisian Fish Viscera
U12-ES03, Department of Biochemistry, Faculty of Medicine Ibn El Jazzar, University of Sousse, Sousse, Tunisia
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U12-ES03, Department of Biochemistry, Faculty of Medicine Ibn El Jazzar, University of Sousse, Sousse, Tunisia
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Laboratoire Universitaire de Biodiversité et d’Ecologie Microbienne (EA3882), IFR148 ScInBioS, Université de Brest, Université Européenne de Bretagne, IUT de Quimper, 6 Rue de l’Université, Quimper Cedex, France.
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Laboratoire Universitaire de Biodiversité et d’Ecologie Microbienne (EA3882), IFR148 ScInBioS, Université de Brest, Université Européenne de Bretagne, IUT de Quimper, 6 Rue de l’Université, Quimper Cedex, France.
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Laboratoire Universitaire de Biodiversité et d’Ecologie Microbienne (EA3882), IFR148 ScInBioS, Université de Brest, Université Européenne de Bretagne, IUT de Quimper, 6 Rue de l’Université, Quimper Cedex, France.
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U12-ES03, Department of Biochemistry, Faculty of Medicine Ibn El Jazzar, University of Sousse, Sousse, Tunisia
1 U12-ES03, Department of Biochemistry, Faculty of Medicine Ibn El Jazzar, University of Sousse, Sousse, Tunisia
2 U12-ES03, Department of Biochemistry, Faculty of Medicine Ibn El Jazzar, University of Sousse, Sousse, Tunisia
3 Laboratoire Universitaire de Biodiversité et d’Ecologie Microbienne (EA3882), IFR148 ScInBioS, Université de Brest, Université Européenne de Bretagne, IUT de Quimper, 6 Rue de l’Université, Quimper Cedex, France.
4 Laboratoire Universitaire de Biodiversité et d’Ecologie Microbienne (EA3882), IFR148 ScInBioS, Université de Brest, Université Européenne de Bretagne, IUT de Quimper, 6 Rue de l’Université, Quimper Cedex, France.
5 Laboratoire Universitaire de Biodiversité et d’Ecologie Microbienne (EA3882), IFR148 ScInBioS, Université de Brest, Université Européenne de Bretagne, IUT de Quimper, 6 Rue de l’Université, Quimper Cedex, France.
6 U12-ES03, Department of Biochemistry, Faculty of Medicine Ibn El Jazzar, University of Sousse, Sousse, Tunisia
A collection of lactic acid bacteria isolates from fish viscera was studied and investigated regarding to their functional properties and safety aspects. From these, three isolates GM1, GM2 and GM3 were identified as Enterococcus feacium species using molecular methods. Partial Amplified rDNA Restriction Analysis (partial ARDRA) with restriction enzyme HaeIII separated these isolates into distinctive group which suggest genotypic variability within enterococci strains isolated from fish viscera. The three strains GM1, GM2 and GM3 exhibited antimicrobial activity. Indeed strains have been shown to produce bacteriocins with inhibitory effect against food spoilage bacteria and pathogenic fish including Carnobacterium maltaromaticum. The molecular mass of bacteriocin, as calculated by tricine-SDS-PAGE, was found to be 4.5 kDa. All isolates were tested positive upon PCR amplification of enterocin A structural gene. Investigations of antibiotic resistance show that the isolates were mostly sensitive to several antibiotics (ampicillin, penicillin, tetracycline, gentamycine) and resistance to rifampicin. All isolates grow in esculin azide agar as a selective medium for enumeration of probiotic enterococci. This study suggests that our strains can be employed as probiotic or to improve the safety of food products.
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