. 2020 Nov 17;100(2):887–899. doi: 10.1016/j.psj.2020.11.020

Table 2.

MS² of the [M-H]^- anions of GPE, plasmalogen GPE (GPEp), and alkyl-acyl GPE (GPEe).

Lipid	Exact Mass¹	[M-H]⁻ ppm	sn-1 FA	sn-1 mass²	sn-1 ppm³	sn-2 FA	sn-2 mass⁴	sn-2 ppm⁵
GPE 34:1	717.5308	1.0	16:0	255.2329	0.60	18:1	282.2558	0.80
GPE 34:2	715.5152	0.17	16:0	255.2329	0.60	18:2	279.2329	1.0
GPE 36:1	745.5621	1.2	18:0	283.2642	0.89	18:1	282.2558	0.44
GPE 36:2	743.5465	0.67	18:0	283.2642	0.89	18:2	279.2329	0.80
			18:1	282.2558	0.80	18:1	282.2558	0.80
GPE 36:4	739.5152	0.67	16:0	255.2329	0.32	20:4	303.2329	0.26
			18:2	279.2329	0.71	18:2	279.2329	0.71
GPE 38:3	769.5621		18:0	283.2642	1.2	20:3	305.2486	1.3
			18:1	282.2558	1.2	20:2	307.2642	0.74
GPE 38:4	767.5465	0.61	18:0	283.2642	0.54	20:4	303.2329	0.32
			18:1	281.2486	0.94	20:3	305.2486	0.96
GPE 38:5	765.5308	0.15	16:0	255.2329	0.56	22:5	329.2486	0.72
			18:1	282.2558	0.87	20:3	303.2329	1.2
GPE 38:6	763.5152	0.55	16:0	255.2329	0.56	22:6	237.2329	0.3
GPE 40:5	793.5618	0.98	16:0	255.2329	0.44	24:5	357.2798	0.11
GPE 40:6	791.5461	1.1	18:0	283.2642	0.54	22:6	237.2329	0.39
GPE 40:8	787.5148	1.9	18:2	279.2329	0.03	22:6	237.2329	1.9
GPE 42:8	815.5465	2.0	20:2	307.2642	0.16	22:6	237.2329	2.2
GPEp 34:1	701.5319	0.73				18:1	282.2558	0.85
GPEp 34:2	699.5202	0.28				18:2	279.2329	0.64
GPEp 36:1	729.5672	1.5				18:1	282.2558	0.28
GPEp 36:2	727.5515	0.72				18:2	279.2329	0.82
GPEp 36:4	723.5202	1.3				20:4	303.2329	0.92
GPEp 38:2	755.5828	1.2				18:2	279.2329	0.50
GPEp 38:4	751.5515	2.2				20:4	303.2329	0.49
GPEe 38:5	751.5515	2.2				22:5	329.2486	2.2

Abbreviations: FA, fatty acid; GPE, glycerophosphoethanolamines.

Exact theoretical parent mass based on a carbon 12.0000 scale.

Exact theoretical sn-1 fatty acid R-COO^- fragment ion mass.

Observed sn-1 fatty acid R-COO^- fragment ion mass accuracy in ppm.

⁴

Exact theoretical sn-2 fatty acid R-COO^- fragment ion mass.

⁵

Observed sn-2 fatty acid R-COO^- fragment ion mass accuracy in ppm.