Article: Nisin prevents spoilage of processed cheese. (natural polypeptide bacteriocin) (includes related article on cheese safety)

Nisin is a naturally occurring polypeptide bacteriocin derived as a fermentation product of Streptococcus lactis Lancefield Group N in milk. Nisin works as bacteriocin against most gram-positive bacteria, including certain strains of Straphylococcus, Lactobacillus, Mircococcus, and practically all spore-forming species of clostridium and Bacillus.

Long used in high-moisture (up to 60 [percent] processed cheesed in Europe, nisin is extremely effective in inhibiting Clostridium and extending shelf life. As U.S. processors adopt formulations with reduced salt and phosphate emulsifiers, nisin can be a proven alternative protection against cheese spoilage.

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