Fig. 6

Growth inhibitory zone of surfactin against C. perfringens using agar-well diffusion assay. C. perfringens were grown in the different concentrations (50, 100, 250, 500 μg/ml) of the surfactin produced from B. subtilis (top left) and B. licheniformis-fermented products (bottom left), blank (top right), and ampicillin (bottom right) for 24 h. The black arrow indicates the inhibition zone. Three experiments were conducted, and one representative result is presented