Fig. 2
Mass spectra of the purified four iturin A homologs produced by B. amyloliquefaciens C2LP. a The peak 1 product showing a molecular ion peak at m/z 1044 corresponds to the protonated form of C14-β-amino acid [C14 + 2H]2+; b the peak 2 product showing a molecular ion peak at m/z 1058 corresponds to the protonated form of C15-β-amino acid [C15 + 2H]2+; c the peak 3 product showing a molecular ion peak at m/z 1072 corresponds to the protonated form of C16-β-amino acid [C16 + 2H]2+; d the peak 4 product showing a molecular ion peak at m/z 1086 corresponds to the protonated form of C17-β-amino acid [C17 + 2H]2+