In the present study soybean (Glycine max L.) was included in cow and camel milk during fermentation. The resulting soybeanyogurt
was evaluated with respect to the changes of post-acidification, viable cell counts (VCC) of Lactobacillus spp. and
Streptococcus thermophilus, total phenolic content (TPC) and antioxidant activity using 1,1-diphenyl-2-picrylhydrazyl radical
(DPPH) inhibition assay during 21 days of refrigerated storage. The presence of soybean in fresh cow- and camel-milk yogurts did
not affect pH reduction compared to respective plain-yogurt. However, soybean–camel milk yogurt showed significant reduction in
pH (4.05 ± 0.06) compared to plain-yogurt 4.35 ± 0.02 on day 7 of storage. Titratable acidity (TA) increased in soybean–cow milk
yogurt (p < 0.05) but not in soybean–camel milk yogurt as compared with respective plain-yogurt during period of storage. The
presence of soybean in fresh yogurt showed increased (p < 0.05) in Lactobacillus spp. VCC by 10% in cow milk-yogurt and 30% in
camel milk-yogurt compared to respective plain-yogurts. On the other hand, VCC of S. thermophilus was higher (p < 0.05) in the
presence ofsoybean in cow milk yogurt than in camel milk yogurt. Soybean–camel milk yogurt had 2-folds higher TPC on day 0 and
7 (149.59 ± 1.8 and 111.44 ± 2.8gGAE/ml respectively) than plain-camel milk yogurt (60.04 ± 0.01 and 55.22 ± 0.01gGAE/ml
respectively). The highest value of TPC in soybean–cow milk-yogurt was showed on day 21 of storage (43.17 ± 1.2gGAE/ml).
The antioxidant activity increased (p < 0.05) in the presence of soybean in both cow and camel milk yogurts compared to respective
controls. The highest antioxidant activity was shown on day 0 for soybean–cow milk yogurt (61.76 ± 2.2%) and day 7 for
soybean–camel milk yogurt (53.16 ± 0.1%). In conclusion, the addition of soybean in both cow- and camel-milk yogurts enhanced
the viability of LAB and antioxidant activity during refrigerated storage.
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