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Table 2 Summary of the detected surfactin lipopeptides extracted from MSM cultured B. amyloliquefaciens ST34, as detected using UPLC-ESI-MS

From: Exploring the antimicrobial resistance profiles of WHO critical priority list bacterial strains

Surfactin groupUPLC Rt
(minutes)a
Proposed peptide sequences in surfactin groupMono-isotopic [M] Exp/theor
Mr
Protonated Specie [M + H]+ Exp/theor m/zSodiated Specie [M + Na]+ Exp/theor m/z
Surfactin 1 (Srf1)10.6; 11.2cyclo[(C13H24O2)-L-Glu-L-Leu-D-Leu-L-Val-L-Asp-L-Leu-L-Val]
cyclo[(C13H24O2)-L-Glu-L-Ile-D-Leu-L-Val-L-Asp-L-Leu-L-Val]
993.6376
993.6403
994.6472
994.6481
1016.6265
1016.6190
Surfactin 2 (Srf2)11.0; 11.2; 11.9cyclo[(C14H26O2)-L-Glu-L-Leu-D-Leu-L-Val-L-Asp-L-Leu-L-Val]
cyclo[(C14H26O2)-L-Glu-L-Ile-D-Leu-L-Val-L-Asp-L-Leu-L-Val]
1007.6521
1007.6552
1008.6531
1008.6592
1030.6392
1030.6414
cyclo-[(C13H24O2)-L-Glu-L-Leu-D-Leu-L-Val-L-Asp-L-Leu-L-Leu]
cyclo[(C13H24O2)-L-Glu-L-Leu-D-Leu-L-Val-L-Asp-L-Leu-L-Ile]
acyclo-[(C13H24O2)-L-Glu-L-Ile-D-Leu-L-Val-L-Asp-L-Leu-L-Leu]
acyclo-[(C13H24O2)-L-Glu-L-Ile-D-Leu-L-Val-L-Asp-L-Leu-L-Ile]
Surfactin 3 (Srf3)11.6; 11.7; 12.3cyclo[(C15H28O2)-L-Glu-L-Leu-D-Leu-L-Val-L-Asp-L-Leu-L-Val]
cyclo[(C15H28O2)-L-Glu-L-Ile-D-Leu-L-Val-L-Asp-L-Leu-L-Val]
1021.6693
1021.6715
1022.6774
1022.6769
1044.6517
1044.6584
cyclo[(C14H26O2)-L-Glu-L-Leu-D-Leu-L-Val-L-Asp-L-Leu-L-Leu]
cyclo[(C14H26O2)-L-Glu-L-Leu-D-Leu-L-Val-L-Asp-L-Leu-L-Ile]
acyclo-[(C14H26O2)-L-Glu-L-Ile-D-Leu-L-Val-L-Asp-L-Leu-L-Leu]
acyclo-[(C14H26O2)-L-Glu-L-Ile-D-Leu-L-Val-L-Asp-L-Leu-L-Ile]
Surfactin 4 (Srf4)12.1; 12.2cyclo[(C15H28O2)-L-Glu-L-Leu-D-Leu-L-Val-L-Asp-L-Leu-L-Leu]
cyclo[(C15H28O2)-L-Glu-L-Leu-D-Leu-L-Val-L-Asp-L-Leu-L-Ile]
acyclo[(C15H28O2)-L-Glu-L-Ile-D-Leu-L-Val-L-Asp-L-Leu-L-Leu]
cyclo[(C15H28O2)-L-Glu-L-Ile-D-Leu-L-Val-L-Asp-L-Leu-L-Ile]
1035.6819
1035.6881
1036.6902
1036.6909
1058.6718
1058.6662
Surfactin 5 (Srf5)12.6; 12.7cyclo[(C16H30O2)-L-Glu-L-Leu-D-Leu-L-Val-L-Asp-L-Leu-L-Leu]
acyclo[(C16H30O2)-L-Glu-L-Leu-D-Leu-L-Val-L-Asp-L-Leu-L-Ile]
acyclo[(C16H30O2)-L-Glu-L-Ile-D-Leu-L-Val-L-Asp-L-Leu-L-Leu]
acyclo[(C16H30O2)-L-Glu-L-Ile-D-Leu-L-Val-L-Asp-L-Leu-L-Ile]
1049.6992
1049.7032
1050.7036
1050.7066
1072.6941
1072.6886
  1. Rt retention time, Theor theoretical Mr, Exp Experimental Mr, a UPLC Retention time of main peaks corresponding to the group’s m/z values