Antioxidant capacity of small black soymilk fermented with ROS-resistant probiotics

The purpose of this study was to assess the resistance to reactive oxygen species (ROS) and probiotic properties of lactic acid bacteria (LAB) isolated from naturally fermented sliced radish kimchi, and to evaluate the fermentation characteristics and antioxidant activity of small black soymilk using ROS-resistant probiotic. Leuconostoc dextranicum SRK03, Lactobacillus brevis SRK15, Lactobacillus acidophilus SRK30, and Lactobacillus pentosus SRK38 displayed strong resistance to ROS and demonstrated probiotic activity. The microbiological and physicochemical characteristics and antioxidant activity of small black soymilk fermented with probiotic LAB were significantly higher than those of non-fermented soymilk, and there was a difference in antioxidant activity depending on the probiotic strain. Strong correlations were observed between the antioxidant activity of fermented probiotic soymilk and various parameters. Specific prebiotics promoted the growth of LAB in probiotic-fermented small black soymilk and significantly increased antioxidant activity, suggesting potential functional benefits as a substitute for traditional dairy products.