Table 5. Identification of Lipopeptides Using ESI MS/MS Analysis Produced by B. subtilis Isolated from the Rat Gut.

metabolites/homologues	M	[M+H]+	[M+Na]+	[M+K]+	references
C12 surfactin	993.92	994.75	1016.83	1033.75	(28)
C13 surfactin	1007.75	1008.83	1030.92	1047.83	(7, 28)
C14 surfactin	1021.83	1022.92	1044.92	1061.75	(7, 27, 28)
C15 surfactin	1035.50	1036.83	1058.75	1074.75	(7, 27, 28)
C16 surfactin	1049.83	1050.92	1072.83	1089.83	(7, 27)
C14 iturin A	1042.67	1043.58	1065.67	1081.58	(7, 27)
C15 iturin A	1056.50	1057.58	1079.67	1095.58	(7, 27)
C16 iturin A	1070.67	1071.58	1093.67	1109.58	(29)