Additional file 1: Figure S1. The ESI-MS total ion mass spectra of the surfactin standard (a), the solvent extracted surfactin lipopeptide produced by B. amyloliquefaciens ST34 when grown in mineral salt medium supplemented with diesel (b), kerosene (c) and sunflower oil (d). The positive mass spectrum generated with MaxEnt 3 is shown. The indicated masses are [Mr + H] and [Mr + H +Na] = m/z values of singly charged species. Figure S2. The ESI-MS total ion mass spectra of the solvent extracted surfactin lipopeptide produced by B. amyloliquefaciens ST34 when grown in mineral salt medium supplemented with fructose (a), glucose (b), glycerol (c) and sucrose (d). The positive mass spectrum generated with MaxEnt 3 is shown. The indicated masses are [Mr + H] and [Mr + H +Na] = m/z values of singly charged species. Figure S3. UPLC-MS ion mass spectra obtained at the chromatogram peak observed at 8.1 min for the solvent extracted rhamnolipid glycolipid produced by P. aeruginosa ST5 when growing in mineral salt medium supplemented with glycerol (a), kerosene (b), sunflower oil (c) and diesel (d). The positive mass spectrum generated with MaxEnt 3 is shown. The indicated masses are [Mr+H] and [Mr+Na] = m/z values of singly charged species.