Fig. 3 shows the results of pH development during the fermentation of soy milk concentrates. A similar behavior was observed, for
all the samples with inulin: during the first hour, the pH decreased
slowly, but after the second hour, the rate increased to stabilize at
4.65 0.05 (P < 0.05) values. Thus, it is confirmed that an adequate
fermentation occurs in all the cases. On the contrary, in the reference
sample (without inulin), the pH decreased until 4.9, above the
isoelectric point of soy proteins (4.2e4.6). Therefore, coagulation
was not carried out and yogurt was not obtained. These results are
consistent with Guven et al. (2005) who reported pH values
between 4.46 and 4.53, for cow milk yogurts replacing the fats with
inulin.
Fig. 3 shows the results of pH development during the fermentation of soy milk concentrates. A similar behavior was observed, forall the samples with inulin: during the first hour, the pH decreasedslowly, but after the second hour, the rate increased to stabilize at4.65 0.05 (P < 0.05) values. Thus, it is confirmed that an adequatefermentation occurs in all the cases. On the contrary, in the referencesample (without inulin), the pH decreased until 4.9, above theisoelectric point of soy proteins (4.2e4.6). Therefore, coagulationwas not carried out and yogurt was not obtained. These results areconsistent with Guven et al. (2005) who reported pH valuesbetween 4.46 and 4.53, for cow milk yogurts replacing the fats withinulin.
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