Two strains of lactobacillus acidophilus,D1-3 and D4-3,were selected according to their biological characteristic tests such as their tolerance to bile salts and growth performance,and their acid tolerance,adhesive ability and bacteriostasi were further tested.
This paper reports on the study of acid tolerance of lactic acid bacteria as a property of cells, determining their ability to divide efficiently and retain viability under conditions of increased nutrient medium acidity during bacterial growth.
Bacteria of the strain STE05 lacked acid tolerance (at pH below 6.5, growth was retarded, and pH 5.0 was the lowest value at which the cells remained viable).
Acid tolerance is inherited in a stable manner and retained by the segregants of TV2 strain obtained in the course of long-term storage of the bacteria.