[Influence of pH on nisin production by Streptococcus lactis cultures]

The pH effect on the nisine biosynthesis during the cultivation of Streptococcus lactis was studied at pH 5,8 6,7 and 7,2. The pH maintenance at the specified level did not stimulate the growth of Str. lactis, did not increase the total yield of nisine and did not produce a significant effect on the level or cellular nisine. This indicates an important physiological difference between the culture-nisine producer described by Hirsh and our culture Str. lactis, str. Moscow University.