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1

Resistance of lactic fermentation bacteria Lactobacillus isolated from natural environments to antibiotics - short report

100%
Laniewska-Moroz L., Warminska-Radyko I., Gradzka J., Dajnowiec M.
Polish Journal of Food and Nutrition Sciences
|
2001
|
tom 10
|
nr 3
The aim of the present paper was to determine the level of resistance of Lactobacillus bacteria isolated from sauerkraut and pickled cucumbers to antibiotics. Lactic fermentation bacteria were isolated on MRS, according to the methodology elaborated by Rogos. Tests API 50 CH (produced by the company bioMerieux) were applied for identification. Resistance to antibiotics was determined employing the diffusion method. It was found that the resistance of Lactobacillus rods isolated from pickled products to antibiotics depended on the strain species and source of its origin. All strains of Lactobacillus planiarum and Lactobacillus brevis were resistant to nalidixic acid, 41.3% of strains turned out to be resistant to kanamycin, while only 3.4% to neomycin. As concerns polypeptide antibiotics, 27.5% of the strains tested were resistant to Colistin. All strains of lactic fermentation bacteria isolated from pickled vegetables were sensitive to ß-lactam antibiotics, riphamycins, furan derivatives and chloramphenicol.
2

Effect of a preparation containing lactic fermentation bacteria on the hygienic status and aerobic stability of silages

84%
Selwet M.
Polish Journal of Veterinary Sciences
|
2008
|
tom 11
|
nr 1
35-39
The objective of this study was to determine the influence of biological silage additive (Bonsilage) on the hygiene quality and nutritive value of maize and grass-legume silages. The experiments were conducted on FAO 240 maize (Zea mays L.) and a mixture of italian ryegrass (Lolium multiflorum L.), 50% with alfalfa (Medicago media Pers.), 50%. Group 1 was a control and comprised silage without any additives, group 2 was ensiled with the addition of 4 cm3 kg-1 biological silage additive. After 60 days of silage process individual silages were subjected to microbiological composition, and chemical analyses of silages were also determined. Similar analyses were repeated at day 7 following exposure to oxygen. The applied biological silage additive was found to reduce (P<0.05) numbers of Clostridium, Enterobacteriaceae, yeasts and mold fungi cells, and increase (P<0.05) the number of LAB (lactic acid bacteria) in comparison with the control in both silages. Chemical analysis of the maize silage showed that the biological additive caused an increase (P<0.05) in DM (dry matter), CP (crude protein), WSC (water soluble carbohydrates), LA (lactic acid), AA (acetic acid), ethanol, and a decrease (P<0.05) in the concentration of BA (butyric acid), N-NH3 and pH value in comparison with the control. Chemical analysis of silage samples from the grass-legume mixture showed that the additive caused an increase (P<0.05) in the content of DM, CP, WSC, LA and AA in comparison with the control. Samples of silage with the addition of an inoculant were characterized by a lower (P<0.05) content of BA, N-NH3, ethanol and pH value. The biological additive impoved the aerobic stability of silages in the aerobic phase.
3

Antibacterial effect of bacteriocins isolated from Lactobacillus strains on selected gram-negative pathogenic rods

84%
Laniewska-Moroz L., Warminska-Radyko I., Dajnowiec M., Gradzka J.
Polish Journal of Food and Nutrition Sciences
|
2001
|
tom 10
|
nr 3
The aim of the present paper was to determine the effect of bacteriocins produced by Lactobacillus strains isolated from pickled vegetables on Gram-negative pathogenic rods. The antibacterial effect of bacteriocins was determined with the diffusion method, employing the well technique. Incubation was carried out for 24 hours, under the optimum conditions for test strains, and then growth inhibition zones around wells were observed. The results obtained show that individual Lactobacillus strains produce antibacterial substances - bacteriocins, characterized by different activity towards selected strains of Yersinia enterocolitica, Salmonella E. coli O 157.H7 and E. coli K88. Test strains were more sensitive to bacteriocins synthesized by Lactobacillus plantarum, as their growth was inhibited at the activity level 4-32 AU/mL. Bacteriocins of Lactobacillus brevis strains inhibited their growth at 128 and 256 AU/mL.
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