The fermentation characteristics of soy yogurt with different content of d-allulose and sucrose fermented by lactic acid bacteria from Kimchi

In this study, to understand whether d-allulose, an ultra-low calorie sweetener, was available in soy yogurt fermentation, we isolated Leuconostoc mesenteroides and Lactobacillus plantarum from kimchi and fermented in soymilk at various contents of d-allulose and sucrose. The lactic acid bacteria counts in soy yogurt had the highest range of 9.23-9.49log CFU/g at 24h fermentation and then decreased. At 48h fermentation, the pH showed 4.31 and 4.52 in the samples containing 75% and 100% d-allulose as sweetener. DPPH radical scavenging activity showed a decreasing tendency as the amount of d-allulose increased. Soy yogurt samples containing d-allulose had higher scores in sweet taste, sour taste and overall preference in sensory evaluation. These findings suggest that d-allulose is beneficial for the development of a low calorie soy yogurt.