Effect of Propionibacterium acidipropionici on the growth of Yersinia enterocolitica.

The antibacterial effect of Propionibacterium acidipropionici culture on a whey medium was determined in preparations subjected to cell inactivation with UV radiation and chloroform treatment; in concentrated biomass, centrifuged and suspended in sterile water; in a preparation subjected to cell inactivation with chloroform. The test strain was Yersinia enterocolitica 8. The preparations and culture were added, as biopreservatives, to broth media where the test strain was cultured, checking periodically the population development.

Effect of high pressure on the survival rate and antibacterial activity of Bifidobacterium strains.

The effect of pressures of 1000, 700 and 400 MPa/15 min on the survival rate of Bifidobacterium infantis 1/1 was studied. 24 h milk cultures, Garsch cultures, and yogurt--to which centrifuged cell biomass of these bacteria was introduced--were subjected to pressurization. It was found that a pressure of 1000 MPa inactivated populations from 10(7) to 10(9) cfu/ml in all the environments examined.

Use of lactic and propionic acid bacteria in the production of fermented parsley juice.

Taking into consideration the proliferation rate of Propionibacterium sp. cells, pH changes and sensory properties of the fermented product obtained, selection of propionic acid bacteria (PAB) was made in order to determine their usefulness for the production of fermented parsley juice. The analysis included 12 strains, belonging to the following species: P.

Effect of Lactobacillus plantarum bacteriocin on gram-negative rods.

The antibacterial effect of bacteriocins synthesized by Lactobacillus plantarum isolated from fermented carrot juice on Enterobacteriaceae rods coming from food was studied in the experiment. Their antibacterial activity was determined employing the diffusion method, well technique. The results show that the bacteriocins examined were characterized by a different effect on test strains whose development was inhibited at the activity level from 256AU/ml to 4AU/mL.