title: Effects of the presence of the curing agent sodium nitrite, used in the production of fermented sausages, on bacteriocin production by Weissella paramesenteroides DX grown in meat simulation medium.
abstract: Weissellin A is a listericidal bacteriocin produced by the sausage-isolated strain of Weissella paramesenteroides DX. The response of the strain to various concentrations of the added curing agent NaNO2 (0.0025, 0.005 and 0.01g/L) was evaluated in bioreactor fermentations using a meat simulation medium. The presence of nitrite suppressed bacteriocin production - the effect being more pronounced with increasing concentrations. Weissellin A was produced as a growth-associated metabolite in the absence of nitrite or its presence in the low concentration of 0.005g/L under aerobic conditions. The suppressive effect of nitrite was apparent under conditions supporting increased specific production rates, e.g. 50% and 100% dissolved oxygen tension, but no effect was observed under anaerobic conditions. As the latter prevail in the microenvironment of fermented meat products, the absence of any influence of nitrite on bacteriocin production is an important finding that enlightens the role of this species of lactic acid bacteria in its common substrates.
authors.affiliation: Department of Hygiene and Technology of Food of Animal Origin, School of Veterinary Medicine, Aristotle University of Thessaloniki, Thessaloniki 54006, Greece. mp2000@vet.auth.gr
authors.forename: M
authors.initials: M
authors.lastname: Papagianni
authors.forename: D
authors.initials: D
authors.lastname: Sergelidis
mesh_terms: D000693:Anaerobiosis; D001430:Bacteriocins / Q000096:biosynthesis*; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D003470:Culture Media; D005285:Fermentation; D008461:Meat Products / Q000382:microbiology*; D010100:Oxygen / Q000378:metabolism / Q000494:pharmacology; D012977:Sodium Nitrite / Q000494:pharmacology*; D058836:Weissella / Q000187:drug effects* / Q000254:growth & development* / Q000378:metabolism
chemical_list: D001430:Bacteriocins; D003470:Culture Media; D012977:Sodium Nitrite; D010100:Oxygen