Table 1. Enriched compounds in fractions 7 and 8.

RT (min)	[M]+	Obs. m/z	Calc. m/z	Error (ppm)	[M]-	Obs. m/z	Calc. m/z	Error (ppm)	Formula	ID
15.05	ND	-	-	-	M-H	229.1808	229.1809	0.46	C13H26O3	Unknown. Likely hydroxylated fatty acid
15.1	M+H	454.2917	454.2928	2.37	M-H	452.2782	452.2783	0.24	C21H44NO7P	LPE(0/16:0)*
15.12	ND	-	-	-	M-H	243.1964	243.1966	0.54	C14H28O3	Unknown. Likely hydroxylated fatty acid
15.16	M+H	335.3047	335.3057	3.09	ND	-	-	-	C21H38N2O	Unknown
15.25	ND	-	-	-	M-H	241.1809	241.1809	0.06	C14H26O3	Unknown. Likely hydroxylated fatty acid
15.32	ND	-	-	-	M-H	243.1964	243.1966	0.51	C14H28O3	Unknown. Likely hydroxylated fatty acid
15.38	M+H	454.2918	454.2928	2.27	M-H	452.2781	452.2783	0.30	C21H44NO7P	LPE(16:0/0)
15.39	M+H	496.3388	496.3398	1.85	M+formate	540.3296	540.3307	2.03	C24H51NO7P	LPC(0/16:0)
15.56	M+H	546.3548	546.3554	1.15	M+formate	590.3465	590.3463	–0.21	C28H53NO7P	LPC(20:3/0)*
15.68	M+H	496.3389	496.3398	1.80	M+formate	540.3297	540.3307	1.89	C24H51NO7P	LPC(16:0/0)
15.76	M+H	522.3548	522.3554	1.25	M+formate	566.3469	566.3463	–0.96	C26H53NO7P	LPC(0/18:1)*
16.01	M+H	522.3546	522.3554	1.65	M+formate	566.3468	566.3463	–0.86	C26H53NO7P	LPC(18:1/0)
21.86	M+H (?)	536.1646	-	-	ND	-	-	-	?	Unknown†

ND; not detected.

^*Predicted metabolite based on molecular formula and MS/MS fragmentation.

^†Likely polysiloxane or similar contaminant. Detected most strongly in fraction 8, but additionally in fractions 4 and 5.