Abstract
Eleven Lactobacillus plantarum from Slovak ovine and caprine lump and stored cheeses, and from four commercial probiotic and yogurt cultures (Lactobacillus plantarum, Lactobacillus reuteri, Lactobacillus acidophilus) identified using a Maldi-TOF MS analysis were screened in vitro for selected aspects correlated with safety (antibiotic susceptibility patterns, biochemical and haemolytic activity, presence of genes responsible for biogenic amines production), functional traits (including acid, bile tolerance and antimicrobial activity), ecological roles (ability to produce biofilms), and technological applications (acidification and milk coagulation capacity) for assurance of their quality and diversity. The antibiotic susceptibility showed two L. plantarum strains, 19l5 and 18l4, with the presence of the non-wild-type ECOFFs (epidemiological cut-off) for clindamycin and/or gentamicin. All these strains expressed a high acid tolerance at pH 2.5 after a 4 h exposure (bacteria viability varied between 60% and 91%), and bile resistance at 0.3% oxgall ranged from 60% to 99% with no haemolytic activity. Three wild L. plantarum strains, 17l1, 16l4, 18l2, had no harmful metabolic activities, and formed strong biofilms that were measured by a crystal violet assay. Simultaneously, the acid cell-free culture supernatant (ACFCS) from L. plantarum 18l2 had a marked inhibitory effect on the viability of the pathogens as evaluated by flow-cytometry, and also exhibited fast acidification and milk coagulation. As a result, we conclude that L. plantarum 18l2 can be included as part of the created lactobacilli collection that is useful as a starter, or starter adjunct, in the dairy industry, due to its desirable safety and probiotic characteristics, together with rapid acidification capacity compared with other investigated strains from commercially accessible products.
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This work is the result of the European Regional Development Fund project 26220220065 and VEGA project No. VEGA 2/0012/16.
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Bujnakova, D., Strakova, E. Safety, probiotic and technological properties of Lactobacilli isolated from unpasteurised ovine and caprine cheeses. Ann Microbiol 67, 813–826 (2017). https://doi.org/10.1007/s13213-017-1310-2
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DOI: https://doi.org/10.1007/s13213-017-1310-2