. Author manuscript; available in PMC: 2008 Feb 4.

Published in final edited form as: Anal Chem. 2005 Jul 15;77(14):4439–4447. doi: 10.1021/ac058000a

Table 1.

Comparative Study of the Zwitterionic Phosphorylated Lipids’ Major Spectral Molecular Ions Observed for the Six Different MALDI Matrixes^a

lipid	DHB	50/50 αCHCA/DHB, 0.1% TFA	PNA	PNA, 0.1% TFA	PNA + butyric acid	PNA + butyric acid, 0.1% TFA
16:0/16:0-PE	[PE + Na]⁺	[PE + Na]⁺	very low signal	[PE + H]⁺	[PE + H]⁺	[PE + H]⁺
	[PE - HG]⁺	[PE - HG]⁺		[PE - HG]⁺		[PE - HG]⁺
16:0-Lyso PC	[PC + H]⁺	[PC + H]⁺	[PC + H]⁺	[PC + H]⁺	[PC + H]⁺	[PC + H]⁺
	[PC + Na]⁺
16:0-SM	[SM + H]⁺	[SM + H]⁺	[SM + H]⁺	[SM + H]⁺	[SM + H]⁺	[SM + H]⁺
	[SM + Na]⁺
14:0/14:0-PC	[PC + H]⁺	[PC + H]⁺	[PC + H]⁺	[PC + H]⁺	[PC + H]⁺	[PC + H]⁺
16:0-PAF	[PAF + H]⁺	[PAF + H]⁺	[PAF + H]⁺	[PAF + H]⁺	[PAF + H]⁺	[PAF + H]⁺

For abbreviations, see text. HG = headgroup.