, while the cells in the core and the surface of the beads were subjected to a different pH.
In this study,
about 5×106 CFU / ml of bifidobacterial cells would be alive,
when 1×109 CFU / ml of cells in beads were kept in simulated gastric juice (pH 2.5) for 120 min. Generally,
the average time to empty half of the stomach contents is 90 min, and the pH of the human stomach is 1–3