Antioxidant activity and viability of lactic acid bacteria in
soybean-yogurt made from cow and camel milk
The indigenous Lactobacillus rhamnosus DSA LR1 was isolated from milk that was obtained from a
restricted geographical area in northeast Italy and it was chosen, among other isolated strains on the
bases of its resistance to the pH of gastric juices, the bile salts, the antibiotics and its lipolytic and
proteolytic activities. The indigenous isolated potential probiotic bacteria were then added in combination
with starter bacteria to the milk used for yogurt production. The results showed that L. rhamnosus
DSA LR1 was able to maintain its viability for the entire shelf-life period without affecting on the viability
or acidification capacity of starter culture.
At the end of the fermentation period, the yogurt that had been co-fermented with L. rhamnosus DSA
LR1 presented an aroma profile that was qualitatively similar to the control yogurt but less intense from a
quantitative point of view. However, all of the major volatile compounds tended to increase during
storage at 4 C for 20 days, yogurt with L. rhamnosus had absolute areas larger than the areas of the
control yogurt for all major carbonyl compounds