Biological properties of aerococci and bacilli as a component of new associate-probiotic complex
AbstractDysbioses of the gastrointestinal tract are common among people of all ages and genders. Development of this pathology is associated with a number of complications, from indigestion to occurrence of malignant disease. Therefore, there is a need in development of measures of their prevention and correction. Probiotics are used as drugs against dysbiosis. Most of the presently known probiotics contain bacterial cells of one species, although combination preparations feature higher efficiency. At the same time, there are difficulties in construction of these drugs, primarily due to incompatibility of physiological properties of microorganisms and mutually antagonistic action of their components. The aim was to examine the compatibility of Bacillus subtilis and Aerococcus viridans in a single preparation, their antagonistic activity against different strains of test-cultures and general antagonism directed on different groups of bacteria for subsequent formation of associative probiotic complex. Properties of aerococci strains were studied and A. viridans 167 strain was selected for inclusion into the probiotic preparation. The tested strain showed the highest indicators of production of hydrogen peroxide, which is one of the mechanisms of antagonistic effect against opportunistic pathogens. General study of biological properties of aerococci strains showed that producing of hydrogen peroxide and superoxide radical in them was conditioned by functioning of NAD-independent lactatoxidase. It has been determined that antioxidant defense of aerococci from the action of endogenous and active excretable forms of oxygen was provided by activity of superoxide-dismutase and GSH-peroxidase. The method of deferred antagonism found no depressing mutual action between probiotic strains of B. subtilis 3 and A. viridans 167 at their joint cultivation. Inhibition of growth at the joint application of A. viridans 167 and B. subtilis 3 strains was recorded for both museum and clinical strains of test-cultures Escherichia coli, Proteus vulgaris, Klebsiella ozaenae, Citrobacter freundii, Pseudomonas aeruginosa, Staphylococcus aureus, S. epidermidis, Candida albicans. Separate application of A. viridans 167 or B. subtilis 3 against strains of these opportunistic pathogens was characterized by relatively less antagonistic effect of each of strains under study. The results allow us to recommend the studied strains of B. subtilis 3 and A. viridans 167 for use as the components to construct a new associative probiotic preparation.
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