Fig. 2

a Batch fermentation of Lactobacillus acidophilus KS400 strain in MRSB with non-controlled pH (initial value of 6.5) at 37 °C. Left axis: absorvance (Abs) at 600 nm; Primary right axis: pH values; Secondary right axis: Relative bacteriocin activity (%); Bottom axis: Time (hours). Symbols: Optical density at 600 nm; Changes in pH values; (-grey bars-) Bacteriocin activity production. b Antimicrobial activity of Lactobacillus acidophilus KS400 strain during fermentation; Activity was tested against Lactobacillus delbrueckii ATCC9649 and plates were incubated at 37 °C; 10% CO₂