Abstract
The effect of adding Saccharomyces boullardii in soya yoghurt was studied. The control was made with soya milk and traditional starter culture (Lactobacillus bulgaricus and Streptococcus thermophilus) while the other three treatments were made by adding 1%, 2%, 3% of S. boulardii with traditional yoghurt starter. Proximate composition of all yoghurt treatments were determined after fermentation time. Shelf-life evaluation of yoghurt treatment were observed during the storage time. During the proximate composition evaluation, treatment with 3% S. boulardii had highest moisture and protein content at 83.43±0.03 and 92±0.3 but least ash and carbohydrate content at 1.2±0.18 and 4.27±0.3. During shelf-life evaluation, titratable acidity and syneresis values of yoghurt with S. boulardii were slightly increased while pH and water holding capacity decreased compared with control yoghurt. After 21 days, S. boulardii counts were 5.89, 6.07 and 6.03 log.cfu/ml for yoghurt with 2% and 3% S. boulardii respectively whereas L. bulgaricus and S. thermophilius of yoghurt with 3% S. boulardii were 7.45 and 8.38 log.cfu/ml respectively. The addition of S. boulardii improved the survivability of the bacteria starter culture.
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