TABLE 2.
MS/MS detection of potential lipopeptides collected from peaks after HPLC purification.
| Lipopeptide | Fatty acid chain | Molecular formula | Calculated (m/z) | ||
| [M+H]+ | [M+Na]+ | [M+K]+ | |||
| Surfactin (peak a) | C14 | C52H91N7O13 | 1,022.68 | 1,044.66 | - |
| C15 | C53H93N7O13 | 1,036.69 | 1,058.67 | - | |
| C16 | C54H95N7O13 | - | 1,072.69 | 1,088.66 | |
| C17 | C55H97N7O13 | - | 1,102.68 | ||
| Iturin A (peak b) | C14 | C48H74N12O14 | 1,043.55 | 1,065.54 | - |
| C15 | C49H76N12O14 | 1,057.57 | 1,079.55 | - | |
The retention time of peak a and b from HPLC system was at 21.4 and 23.6 min, respectively.