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Table 1 Summary of the surfactins extracted from B. amyloliquefaciens ST34, as detected with high resolution mass spectrometry (<10 ppm)

From: Variants of lipopeptides and glycolipids produced by Bacillus amyloliquefaciens and Pseudomonas aeruginosa cultured in different carbon substrates

Surfactin group (Abbr) Rt (min)a Characterised and proposed* peptide sequences in surfactin group Mono-isotopic
Exp/Theor M r
Protonated species
Exp/Theor
m/z
Sodiated species
Exp/Theorm/z
Surfactin 1 (Srf1) 10.7; 10.8; 11.5; 11.6 Cyclo[(C 13 H 24 O 2 )-l-Glu-l -Leu-d-Leu-l-Val-l-Asp-l-Leu-l -Val] 993.6376 994.6473 1016.6365
Cyclo[(C 13 H 24 O 2 )-l-Glu-l -Ile-D-Leu-l-Val-l-Asp-l-Leu-l -Val] 993.6403 994.6481 1016.6259
Surfactin 2 (Srf2) 11.3; 11.4; 12.1; 12.2 Cyclo[(C 14 H 26 O 2 )-l-Glu-l -Leu-D-Leu-l-Val-l-Asp-l-Leu-l -Val]
Cyclo[(C 14 H 26 O 2 )-l-Glu-l -Ile-D-Leu-l-Val-l-Asp-l-Leu-l -Val]
1007.6565 1008.6608 1030.6415
Cyclo-[(C 13 H 24 O 2 )-l-Glu-l -Leu-D-Leu-l-Val-l-Asp-l-Leu-l -Leu]
Cyclo[(C 13 H 24 O 2 )-l-Glu-l -Leu-D-Leu-l-Val-l-Asp-l-Leu-l -Ile]
*Cyclo-[(C 13 H 24 O 2)-l-Glu-l -Ile-D-Leu-l-Val-l-Asp-l-Leu-l -Leu]
*Cyclo-[(C 13 H 24 O 2 )-l-Glu-l -Ile-D-Leu-l-Val-l-Asp-l-Leu-l -Ile]
1007.6552 1008.6596 1030.6416
Surfactin 3 (Srf3) 11.8; 11.9; 12.0 Cyclo[(C 15 H 28 O 2 )-l-Glu-l -Leu-D-Leu-l-Val-l-Asp-l-Leu-l -Val]
Cyclo[(C 15 H 28 O 2 )-l-Glu-l -Ile-D-Leu-l-Val-l-Asp-l-Leu-l -Val]
1021.6693 1022.6773 1044.6582
Cyclo[(C 14 H 26 O 2 )-l-Glu-l -Leu-D-Leu-l-Val-l-Asp-l-Leu-l -Leu]
cyclo[(C 14 H 26 O 2 )-l-Glu-l -Leu-D-Leu-l-Val-l-Asp-l-Leu-l -Ile]
*Cyclo-[(C 14 H 26 O 2 )-l-Glu-l -Ile-D-Leu-l-Val-l-Asp-l-Leu-l -Leu]
*Cyclo-[(C 14 H 26 O 2 )-l-Glu-l -Ile-D-Leu-l-Val-l-Asp-l-Leu-l -Ile]
1021.6715 1022.6752 1044.6572
Surfactin 4 (Srf4) 12.4 Cyclo[(C 15 H 28 O 2 )-l-Glu-l -Leu-D-Leu-l-Val-l-Asp-l-Leu-l -Leu]
Cyclo[(C 15 H 28 O 2 )-l-Glu-l -Leu-D-Leu-l-Val-l-Asp-l-Leu-l -Ile]
*Cyclo[(C 15 H 28 O 2 )-l-Glu-l -Ile-D-Leu-l-Val-l-Asp-l-Leu-l -Leu]
Cyclo[(C 15 H 28 O 2 )-l-Glu-l -Ile-D-Leu-l-Val-l-Asp-l-Leu-l -Ile]
1035.6819 1036.6896 1058.6737
1035.6881 1036.6909 1058.6729
  1. The proposed chemical structures, theoretical (Theor) and experimental (Exp) M r and monoisotopic m/z values, as well as observed UPLC retention times for representative examples are provided
  2. aUPLC retention time of main peaks corresponding to the groups m/z values