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  • Title: Pediocin production in milk by Pediococcus acidilactici in co-culture with Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus.
    Author: Somkuti GA, Steinberg DH.
    Journal: J Ind Microbiol Biotechnol; 2010 Jan; 37(1):65-9. PubMed ID: 19844751.
    Abstract:
    The production of pediocin in milk by Pediococcus acidilactici was evaluated in co-culture with the dairy fermentation cultures Streptococcus thermophilus and Lactobacillus delbrueckii ssp. bulgaricus. The cultures were tested singly and in different combinations in milk (0 or 2% fat content) during incubation at 40 degrees C for up to 10 h. Cell-free milk samples taken every 60 min were tested for bacteriocin activity against Listeria monocytogenes. Pediocin activity was not detectable when P. acidilactici was inoculated into milk as a monoculture. When P. acidilactici was grown in combination with the yogurt starter cultures S. thermophilus and Lb. delbrueckii ssp. bulgaricus, pediocin concentration reached 3,200-6,400 units ml(-1) after 8 h of incubation. The results showed that pediocin producing pediococci may be useful adjunct components in mixed cultures of S. thermophilus and Lb. delbrueckii ssp. bulgaricus to amplify the bioprotective properties of fermented dairy foods against Listeria contamination.
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