Table 1.

Peak numbers, retention times, mass ion peaks, and assignment of the fatty acid moiety of surfactin.

Peak number	UPLC retention time (min)	Mass peak (m/z)		Assignment
		[M + H]+	[M + Na]+
11	5.84	994.62		C12-surfactin
12; 13; 15	5.96; 6.10; 6.23	1008.65	1031.54	C13-surfactin
12; 16	6.10; 6.34	1022.67	1045.60	C14-surfactin
11; 2; 4; 5; 6; 7; 8; 9; 10; 15	4.15; 4.24; 4.61; 4.76; 4.97; 5.25; 5.47; 5.61; 5.73; 6.23	1036.69	1059.63	C15-surfactin
1; 16	4.15; 6.34	1050.71	1073.69	C16-surfactin