Fig. 4
From: Engineering of a genome-reduced strain Bacillus amyloliquefaciens for enhancing surfactin production
HPLC–MS chromatograms of surfactin standard and the samples produced by GR167. a HPLC chromatograms of surfactin from standard and GR167; b MS (mass spectra) of surfactin standard (Sigma); c MS of purified surfactin homologs produced by GR167. The peaks 1, 2, 3, and 4 products corresponding to the molecular ion peaks at m/z 995, 1009, 1023, and 1037, respectively