The scope of the study is to study the biological properties of dietary supplements line: LactoBalance multiprobiotic, Neobiotic Lactobalance and Neobiotic Lactobalance Baby/Lactobalance Baby, isolation and generic identification of probiotic microorganisms from samples, confirmation of their growth properties and study of their antibiotic resistance. Materials and methods. The study confirmed that the number of probiotic microorganisms in the Lactobalance product line corresponds to those declared by the manufacturer. From biologically active food additives, probiotic microorganisms were isolated, identified and classified according to GOST R 56139-2014, MU 2.3.2.2789-10 [6, 7] and matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF). Isolation and cultivation of bifidobacteria strains and thermophilic streptococcus were carried out on a nutrient medium for the cultivation and isolation of bifidobacteria (FBSI SSC PMB, Obolensk, Russia), lactobacilli strains – on a nutrient medium MRS (HiMedia Laboratories Pvt. Limited, India). The growth properties of isolated probiotic microorganisms were studied by passaging them on nutrient media and their r
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