All of the fermented milk cultures were incubated at 37 °C and were
monitored automatically (recorded every 5 min) for pH using a Cinac
system(Alliance Instruments,Mery-Sur-Oise, France) during milk acidification. The number of viableL. casei and S. thermophilus cells were
selectively counted during fermentation using MRS (fermented milk
sampled every 12 h for 72 h) and LM17 (fermented milk sampled every
2hfor24h)agarrespectively.