Use of selective media to determine species affiliation of lactic acid bacteria
Keywords:
Lactococcus, Lactoccocus lactis subsp. lactis biovar. diacetylactis, selective mediumAbstract
Accurate and fast differentiation of mesophilic Lactococcus is an urgent issue, because these organisms are of great industrial importance. The research paper presents nutrient media comparative assessment data (Reddy, Kempler, Agar with calcium acid citrine) for the identification of lactic acid bacteria of the genus Lactococcus, in particular strains Lactoccocus lactis subsp. lactis and Lactoccocus lactis subsp. lactis biovar. diacetylactis. It is shown that taking into account the similarity of the metabolic properties of the strains belonging to the genus Lactococcus the identification procedure should combine application of several selective media. In order to prove belonging to the L. diacetylactis simultaneous cultivation on Kempler and Agar with calcium acid citrine selective media is recommended. It was also featured the expediency of addition of 0.2% sodium citrate to the inoculated medium in order to enhance the flavor-forming properties of L. diacetylactis.
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