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Evidence for Two Bacteriocins Produced by Carnobacterium piscicola and Carnobacterium divergens Isolated from Fish and Active Against Listeria monocytogenes

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Abstract:

Lactic acid bacteria (LAB) isolated from fish products (fresh fish, smoked and marinated fish, fish intestinal tract) were screened for bacteriocin production and immunity in conditions eliminating the effects of organic acids and hydrogen peroxide. Twenty-two isolates which were found to produce bacteriocin-like compounds were identified as Camobacteria, Lactococci and Enterococci on the basis of morphological examination, gas production from glucose, growth temperatures, configuration of lactic acid, carbohydrates fermentation and deamination of arginine. Two Carnobacteria named V1 and V41 were selected for further studies and identified by DNA-DNA hybridization as Camobacterium piscicola and Camobacterium divergens, respectively. Their respective bacteriocins named piscicocin V1 and divercin V41 were heat-resistant and sensitive to various proteolytic enzymes. These bacteriocins were active against Listeria monocytogenes and exhibited a different spectrum of activity against LAB. Both bacteriocins had a bactericidal and non-bacteriolytic mode of action. Maximum production of piscicocin V1 and divercin V41 in Man Rogosa Sharpe (MRS) medium broth occurred at the beginning of the stationary phase and was higher at 20°C than at 30°C. When the cultures were maintained at pH 6.5, bacteriocin production was significantly increased.

Keywords: BACTERIOCINS; CAMOBACTERIUM; LACTIC ADD BACTERIA; SEAFOODS

Document Type: Research Article

Affiliations: 1: ENITIAA, Laboratoire de Microbiologie, 44072 Nantes Cedex, France 2: ENITIAA, Laboratoire de Microbiologie, 44072 Nantes Cedex, France; INRA, Station de Recherches Laitieres, 78352 Jouy en Josas Cedex, France

Publication date: 1995-03-01

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