Fig. 3From: Characterisation and antimicrobial activity of biosurfactant extracts produced by Bacillus amyloliquefaciens and Pseudomonas aeruginosa isolated from a wastewater treatment plantExamples of the ESI–MS mass spectra of three major surfactin groups detected with UPLC–MS. The positive mass spectrum generated with MaxEnt 3 is shown. The indicated masses are [M r+H] = m/z values of singly charged species. Refer to Table 3 for identities of Srf1-5 and expected m/z and M r valuesBack to article page