Mixture of selected bacterial strains could be adopted to obtain desirable characteristics
such as high probiotic viable cells,
fast acidification, and goodflavor.
For the intrinsic intracellular proteolytic enzymes, it is possibly beneficial to lyse the cells to exploit them when co-cultured with probiotic bacteria.
Therefore, a specific bacteriophage for S. thermophilus was
supplemented to the co-cultures to investigate the interaction between
S. thermophilus and L. casei(LC-ST-P)