Two replicate trials were conducted in the manufacture of
yogurt with the soy milk. Manufacturing stages for the production
of soy yogurt with inulin is shown in Fig. 1. Experimental groups
were divided into five parts, one was reserved as control and inulin
was added to the others in different ratio: 20, 30, 50 and 70 g/
100 g. The samples were pasteurized at 90 1 C for 30 s, then they
were cooled to 38 1 C and inoculated with 20 mL of the
microorganisms and kept at 41 2 C. During the fermentation
stage the acidity development was studied, and the process was
stopped cooling to 4 2 C when the product reached
a pH ¼ 4.65 0.05.
A.N. Ri