Fig. 1 Comparison of biosurfactants and broadspectrum antibiotics in a radial diffusion assay. Aliquots of rhamnolipid (Rh) and a plant biosurfactant (PB) (20 lg/ml), ampicillin (AMP), chloramphenicol (CHL) and kanamycin (KAN) (5 lg/ml) were assayed in a radial diffusion assay against a lawn of a B. subtilis, b C. sakazakii, c S. aureus, d E. coli, e M. luteus and f K. pneumoniae. The inhibition of substances was determined by the measurement of the radius of the zone of inhibition ZOI after overnight incubation. The values are recorded as mean inhibition ±SEM (mm), n = 4
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