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The ability of Lactococcus lactis subsp. lactis bv. diacetylactis strains in producing nisin
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The ability of Lactococcus lactis subsp. lactis bv. diacetylactis strains in producing nisin
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Journal Article
The ability of Lactococcus lactis subsp. lactis bv. diacetylactis strains in producing nisin
2020
Overview
Lactococcus lactis subsp. lactis bv. diacetylactis is a relevant microorganism for the dairy industry because of its role in the production of aromatic compounds. Despite this technological property, the identification of bacteriocinogenic potential of obtained strains can offer the additional positive aspect of biosafety. A panel of 15 L. lactis subsp. lactis bv. diacetylactis strains was characterised for the presence and expression of bacteriocin related genes, and further investigated regarding the nisin operon. Eight strains were positive only for nisA, and one strain (SBR4) presented a full nisin operon, with sequencing that was shown to be similar to nisin Z. Only SBR4 presented inhibitory activity against 16 microbial target strains. The growth curves of selected targets strains confirmed the inhibitory activity of SBR4 and consequently the nisin production. This research has demonstrated the inhibitory potential of L. lactis subsp. lactis bv. diacetylactis strain, SBR4, due to its ability to produce nisin Z. This biopreservative potential, associated to previously characterised technological properties, allow the indication of this strain as a promising candidate to be used by the dairy industry as a starter or adjunct culture.
Publisher
Springer Nature B.V
