Abstract In the study, four potent Lactobacillus cultures of L. rhamnosus K4E, plantarum RD7, fermentum K7, and K16 were considered for production B-vitamins, organic acids biotransformation soy isoflavones. RD7 showed highest B 2 (0.84 μg mL −1 ) after 36 h, while exhibited maximum 12 (0.084 h. K4E produced 0.24 folate Highest lactate (16.43 acetate (5.86 was reported by K4E. butyrate (0.253 c...