title: Separation of the molecular species of intact phosphatidylethanolamines and their N-monomethyl and N,N-dimethyl derivatives by high-performance liquid chromatography on a C8 column.
abstract: We have developed a gradient reversed-phase C8 high-performance liquid chromatography method for the separation of molecular species of phosphatidylethanolamines (PEs) and their N-monomethyl and N,N-dimethyl derivatives. This method uses a 40-min linear gradient of 88-100% methanol, containing ammonium hydroxide as silanol suppressing agent, and is suitable for metabolic studies using both UV detection at 205 nm and radioactivity flow detection. The elution order of a given PE is inversely related to the polarity of its fatty acid constituents. Lipid classes studied here containing the same fatty acyl chains elute in the order: PE-N,N-dimethyl<PE<PE-N-monomethyl<phosphatidylcholine, indicating that elution order is not simply a function of the numbers of methyl groups on the nitrogen atom of PE.
authors.affiliation: Western Regional Research Center, Agricultural Research Service, US Department of Agriculture, Albany, CA 94710, USA. jtlin@pw.usda.gov
authors.forename: J T
authors.initials: JT
authors.lastname: Lin
authors.forename: K M
authors.initials: KM
authors.lastname: Lew
authors.forename: J M
authors.initials: JM
authors.lastname: Chen
authors.forename: T A
authors.initials: TA
authors.lastname: McKeon
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D010714:Phosphatidylethanolamines / Q000737:chemistry / Q000302:isolation & purification*; D011874:Radiometry; D013056:Spectrophotometry, Ultraviolet
chemical_list: D010714:Phosphatidylethanolamines