Influence of various prebiotic components on the main growth indicators of probiotic bacteria
The study aimed to select prebiotic components and determine their effect on the primary growth rates of probiotic bacteria (lactobacilli, bifidobacteria). Strains Bifidobacterium adolectentis No 17-316 and Lactobacillus plantarum No 7-317 were used to create the bacterial mixture. When determining the effectiveness of various sources of sugar on the intensity of growth parameters of lactic acid bacteria, experimental nutrient media were prepared with the addition of lactulose, inulin, fructose in amounts of 1.0%, 1.5%, and 2.5%. It has been experimentally proved that the use of lactulose at a concentration of 1.5% as a prebiotic component in the bacterial mixture based on lactobacilli L. plantarum No 7-317 and bifidobacteria B. adolectentis No 17-316 (1:2) increases the biological activity of the mixture: acid formation activity – by 10±2%, the number of live bacteria – by 15±2%. It has been established that lactulose has a higher bifidogenic and lactogenic effect than other sources of sugar (inulin, fructose). Based on the study of morphological characteristics of bacterial cultures of symbiotic types of interaction and study of the bifidogenic and lactogenic ability of some sugars, the composition of the bacterial mixture of therapeutic and prophylactic action has been substantiated: L. plantarum No 7-317 and B. adolectentis No 17-316 in the ratio 1:2 and prebiotic component – lactulose (1.5%). The optimal growth parameters for bifidobacteria – cultivation temperature 38.7±0.4°C and pH of the medium 6.7±0.3, and for lactobacilli – cultivation temperature 37.3±0.2°C and pH of the medium 7.2±0.1.