title: Individual Phosphatidylcholine Species Analysis by RP-HPLC-ELSD for Determination of Polyenylphosphatidylcholine in Lecithins.
abstract: Polyenylphosphatidylcholine (PPC), a subgroup of the bioactive agents in phosphatidylcholine (PC), has been indicated to possess liver-protective effects. This study aimed to investigate a promising and feasible method to determine PC molecular species with a reverse phase (RP) high-performance liquid chromatograph (HPLC) equipped with an evaporative light scattering detector (ELSD). Chromatography was achieved using a C30 column and an isocratic mobile phase consisting of acetonitrile/methanol/triethylamine (40/58/2, v/v/v) at a flow rate of 1 mL/min, and ELSD detection was performed using 80 °C for the drift tube and an air flow rate of 1.8 L/min. To identify individual peaks on the chromatogram, MALDI-TOF-MS was employed for initial detection, and then the results were used to investigate the relationship between the retention time and fatty acyl chains of each PC molecule. A linear correlation was observed between the retention time and theoretical carbon number (TCN) of individual PC species. The compositions of PC molecular species in soybean and sunflower lecithins were similar to each other, and the major PC molecular species were 1,2-dilinoleoyl-sn-glycero-3-phosphocholine (LLPC), 1-oleoyl-2-linoleoyl-sn-glycero-3-phosphocholine (OLPC), and 1-palmitoyl-2-linoleoyl-sn-glycero-3-phosphocholine (PLPC). The contents of LLPC in soybean PC and sunflower PC were 40.6% and 64.3%, respectively.
authors.affiliation: †Department of Agricultural Chemistry, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Wei-Ju
authors.initials: WJ
authors.lastname: Lee
authors.affiliation: ‡Department of Food Science and Nutrition, Meiho University, Pingtung County 91202, Taiwan.
authors.forename: Shun-Hsiang
authors.initials: SH
authors.lastname: Weng
authors.affiliation: †Department of Agricultural Chemistry, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Nan-Wei
authors.initials: NW
authors.lastname: Su
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D054709:Lecithins / Q000032:analysis*; D010713:Phosphatidylcholines / Q000032:analysis*
chemical_list: D054709:Lecithins; D010713:Phosphatidylcholines; C005152:lipostabil
keywords: MALDI-TOF-MS; RP-HPLC-ELSD; lecithin; phosphatidylcholine molecular species; polyenylphosphatidylcholine; theoretical carbon number