The broth for the accumulation of lactic acid bacteria and identification of their growth. Liquid nutrient medium is characterized by a high growth quality, thereby contributes to the rapid development of lactic acid bacteria. Inhibitors and selective agents are absent, so clear culture is necessary to use. The indicator bromocresol purple reveals the formation of acids (metabolic products of the bacteria) by the color change from purple to yellow. The time of culturing 48 hours at 37 °C.