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. Author manuscript; available in PMC: 2011 Feb 1.

Published in final edited form as: J Mass Spectrom. 2010 Feb;45(2):223–226. doi: 10.1002/jms.1707

Table 1.

Examples of polar lipids detected in the positive and negative ion modes differing by less than 0.1 Th

negative ion mode
measured m/z	proposed formula	error (ppm)	molecular identity
834.5284	C₄₆H₇₇O₁₀NP	0.575	40:6 diacyl GPSer
834.5766	C₄₄H₈₄O₁₁NS	0.72	C20 Sulfatide
863.6105	C₄₅¹³CH₈₈O₁₁NS	−0.104	C22 sulfatide, ¹³C
863.5609	C₄₅H₈₄O₁₃P	−3.555	36:1 diacyl GPIns
886.5527	C₄₆¹³C H₈₂O₁₃ P	0.609	38:4 diacyl GPIns, ¹³C
888.6226	C₄₈H₉₀O₁₁NS	−0.28	C24:1 sulfatide
909.6562	C₄₅¹³C₃H₉₂O₁₂NS	6.711	C24-OH sulfatide, ¹³C
909.5487	C₄₉H₈₂O₁₃P	−0.035	40:6 diacyl GPIns
positive ion mode
768.5308	C₄₁H₈₀O₇NP+K	0.391	36:1 diacyl GPEns
768.5882	C₄₂H₈₄O₇NP+Na	0.418	34:1 plasmalogen GPCho
784.5622	C₄₂H₈₄O₇NP+K	0.461	34:1 plasmalogen GPCho
784.5834	C₄₂H₈₄O₈NP+Na	0.714	34:0 GPCho
806.5103	C₄₃H₇₈O₈NP+K	0.637	38:4 diacyl GPEtn
806.5700	C₄₆H₈₁O₈NP	0.569	38:6 diacyl GPCho
832.5835	C₄₆H₈₄O₈NP+Na	0.966	38:4 diacyl GPCho
832.6645	C₄₈H₉₁O₈N+Na	0.973	C24:1 GlcCer
848.5577	C₄₆H₈₄O₈NP+K	1.269	38:4 diacyl GPCho
848.6386	C₄₈H₉₁O₈N+K	1.147	C24:1 GlcCer