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- W1963668144 abstract "In this work we studied using different molecular methods the population dynamics of nisin-producing organisms and the persistence of such organisms within a complex ecosystem, 'Fior di latte' cheese, a traditional high-moisture pasta filata cheese. Using the primers targeting the eubacterial 16S-23S rRNA spacer region, together with those amplifying the nisA or nisZ gene, we were able to provide a rapid species identification of the isolates. Inhibitors of Lactococcus lactis subsp. lactis DSM 20481T used as indicator occurred during the whole process of cheese manufacture as a significant part of lactic microflora; however, only 12 among 109 isolates of bacteriocin producers were nisin producers. Amplification of the nisA or nisZ gene, using DNA extracted directly from dairy samples as templates, showed that the nisin structural gene was detected during cheese-making from milk samples up to the end of curd ripening but not in the final cheese. In order to monitor nisin-producing strains during cheese manufacturing, the 12 Lactococcus lactis nis+ strains were analysed by low frequency restriction fragment and PFGE. Nine isolates among the 12 nisin-producers exhibited an unique and distinct DNA banding pattern and are considered to be genetically diverse. The other three isolates from curd after ripening showed the same restriction pattern and could be the same strain. In fact, it was also isolated 2 months after the first analysis of cheese-making of 'Fior di latte'." @default.
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- W1963668144 date "2001-01-01" @default.
- W1963668144 modified "2023-10-14" @default.
- W1963668144 title "Nisin-producing organisms during traditional ‘Fior di latte’ cheese-making monitored by multiplex-PCR and PFGE analyses" @default.
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- W1963668144 doi "https://doi.org/10.1016/s0168-1605(00)00411-6" @default.
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