The presence of salt and a curing agent reduces bacteriocin production by Lactobacillus sakei CTC 494, a potential starter culture for sausage fermentation.
The specific conditions in the batter of raw fermented sausages may reduce the efficiency of bacteriocin-producing starter cultures. In this work, using in vitro fermentation, we found that sodium chloride and sodium nitrite interfere with the growth of Lactobacillus sakei CTC 494, an organism which produces the antilisterial bacteriocin sakacin K. Because sakacin K production follows primary metabolite kinetics, a decrease in cell formation resulted in a decrease in sakacin K production as well. Sodium chloride dramatically influenced bacteriocin production by decreasing both biomass production and specific bacteriocin production. Sodium nitrite, however, had no effect on specific bacteriocin production and decreased bacteriocin production only because of its effect on cell growth. Moreover, sodium nitrite enhanced the toxic effect of lactic acid on bacterial growth.
Leroy
F
F
Research Group of Industrial Microbiology, Fermentation Technology and Downstream Processing (IMDO), Department of Applied Biological Sciences, Vrije Universiteit Brussel, B-1050 Brussels, Belgium.
de Vuyst
L
L
D001430:Bacteriocins / Q000096:biosynthesis*; D018533:Biomass; D005285:Fermentation; D005511:Food Handling; D005990:Glycerol / Q000494:pharmacology; D007700:Kinetics; D007778:Lactobacillus / Q000187:drug effects / Q000254:growth & development*; D008461:Meat Products / Q000382:microbiology*; D012965:Sodium Chloride / Q000494:pharmacology*; D012977:Sodium Nitrite / Q000494:pharmacology*
D001430:Bacteriocins; D012965:Sodium Chloride; D012977:Sodium Nitrite; D005990:Glycerol