Fig. 6From: Exploiting the aerobic endospore-forming bacterial diversity in saline and hypersaline environments for biosurfactant productionESI–MS/MS triple quadrupole mass spectrometry in negative ion mode of the crude extracts of four strains: (a) Commercial surfactin (Sigma Aldrich) used as positive control, (b) B. asahii DR 2.0, (c) B. subtilis AB 2.0, (d) B. infantis VM 6.0 and (e) B. infantis VM 8.0Back to article page