The pH of the fermented milk inoculate withL. caseialone (LC) decreased slowly in the early fermentation stage,
but fast acidification was observed after incubating for 6 h.
Co-culture of L. caseiand S. thermophilus(LC-ST) appeared to combine the advantages
of the two strains.
In these co-cultures, the pH of the inoculated fermented milk decreased constantly throughout the incubation, indicating that the dual inoculators had a higher level of acidification capability.