Metal ion complexes in the structural analysis of phospholipids by electrospray ionization tandem mass spectrometry.
The effects of metal cationization on collisionally activated dissociation (CAD) of phospholipids were investigated by electrospray ionization with quadrupole ion trap tandem mass spectrometry. The metal ions include Li(+), Na(+), K(+), Sr(2+), Ba(2+), and the first transition series. CAD of the transition metal ion-bound lipid complexes gave significant yields of product ions that identify the positions of the two fatty acyl substituents on the glycerophospholipid backbone. The cobalt(II) ion, which has a single naturally occurring isotope, was expected to be a better cationization reagent as it produces simpler mass spectra than other transition metal ions. CAD of the cobalt(II) ion complexes of glycerophosphoethanolamines, glycerophosphoglycerols and glycerophosphoserines yielded product ions that revealed information regarding both the lipid classes and the regiospecific positions of the two fatty acyl substituents.
Ho
Yen-Peng
YP
Department of Chemistry, National Dong Hwa University, Hualien, Taiwan, ROC. ypho@mail.ndhu.edu.tw
Huang
Ping-Chen
PC
Deng
Kuang-Hao
KH
D005994:Glycerophosphates / Q000737:chemistry; D007477:Ions / Q000032:analysis* / Q000737:chemistry; D008670:Metals / Q000032:analysis* / Q000737:chemistry; D015394:Molecular Structure; D010714:Phosphatidylethanolamines / Q000737:chemistry; D010743:Phospholipids / Q000737:chemistry*; D010768:Phosphoserine / Q000031:analogs & derivatives* / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
D005994:Glycerophosphates; D007477:Ions; D008670:Metals; D010714:Phosphatidylethanolamines; D010743:Phospholipids; C409185:diglycerol phosphate; C002449:glycerophosphoethanolamine; D010768:Phosphoserine; C067651:glycerophosphoserine