title: Wheat digalactosyldiacylglycerol molecular species profiling using porous graphitic carbon stationary phase.
abstract: The potential of porous graphitic carbon stationary phase (PGC) was assessed for the separation of molecular species of digalactosyldiacylglycerol (DGDG). Detection was by an evaporative light scattering detector (ELSD). A conventional optimization strategy allowed definition of a quaternary non-aqueous mobile phase and separation of 9 wheat DGDG molecular species with isocratic elution: methanol/toluene/tetrahydrofuran/chloroform 64.3/21.5/13.7/0.5 v/v with 0.1% of triethylamine and a stoichiometric amount of formic acid. The molecular species were identified by LC/MS. The chromatographic behavior of DGDG on PGC was then compared to previous studies. The addition of a carbon double bond on the alkyl chain decreased the retention. This contribution was less important when the number of unsaturations increased in the alkyl chain. The consequence of this retention behavior with PGC was an elution order of molecular species which did not agree with the partition number as observed with C18 grafted stationary phases.
authors.affiliation: Groupe de Chimie Analytique de Paris-Sud, EA 3343, Laboratoire de Chimie Analytique, Faculté de pharmacie, 5 rue Jean-Baptiste Clement, 92296 Châtenay-Malabry cedex, France.
authors.forename: Frantz S
authors.initials: FS
authors.lastname: Deschamps
authors.forename: Karen
authors.initials: K
authors.lastname: Gaudin
authors.forename: Arlette
authors.initials: A
authors.lastname: Baillet
authors.forename: Pierre
authors.initials: P
authors.lastname: Chaminade
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation* / Q000379:methods*; D005227:Fatty Acids / Q000378:metabolism; D038983:Galactolipids / Q000032:analysis* / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006108:Graphite / Q000737:chemistry*; D015394:Molecular Structure; D016062:Porosity; D012997:Solvents / Q000737:chemistry; D014908:Triticum / Q000737:chemistry*
chemical_list: D005227:Fatty Acids; D038983:Galactolipids; D012997:Solvents; C007388:digalactosyldiacylglycerol; D006108:Graphite