Each inoculation was sufficient to attain initial counts
of 108 cfu mL1. The pH of each sample was determined directly
using a calibrated digital pH meter (PB-10; Sartorius, Goettingen,
Germany) during fermentation. At pH 4.5, a portion of the fermented
products was immediately transferred to an ice bath to
stop the fermentation and the products were stirred and poured
into plastic cups to make plain stirred yoghurts and kept at 4 C for
further assay of post acidification, texture and sensory qualities.
The rest of products were continued to ferment for 15 h for acidification
kinetics analysis.