The amino-acid and elemental composition of a hydrolysate based on lactic-acid bacterial cultures has been studied. The quantitative content of amino acids in the hydrolysate is determined and the analytical method is validated with respect to linearity, reproducibility, and accuracy. Investigation of the biological activity of the hydrolysate by three-day cultivation with cells showed evidence for stimulation of the expression of T-lymphocytes (CD3+) and their subpopulation with helper activity (CD4+).

The object of research is the hydrolysate of the lactobacteria components of the polycomponent sour milk stock BKUglich №4 . The hydrolysate has been obtained by the fermentative hydrolysis with microbial rennin «eito» The biological activity of obtained hydrolysate has been examined. Bacteria lysate immunotropic effects have been found to be due to the increase of neutrophilic granulocyte phagocytic activity. It was supposed that the earlier studied hydrolysate antioxidant activity caused by the normalization of the phagocyte superxide anionradical production leads to the cell immunity normalization.