title: Procedure for separation of GM2 ganglioside species with different ceramide structures by a flash reversed-phase silica gel liquid chromatography.
abstract: GM2 ganglioside, beta-GalNAc-(1-4)-[alpha-Neu5Ac-(2-3)-]beta-Gal-(1-4)-beta-Glc-(1-1)-Cer, is the main ganglioside in the brain of Tay-Sachs patients. In this work, GM2 ganglioside was extracted from a Variant B Tay-Sachs human brain, purified to homogeneity of the oligosaccharide moiety by silica gel chromatography. It was further fractionated for the first time into the molecular species differing in the ceramide structures by reverse-phase flash chromatography. The GM2 ganglioside species were characterized by gas-chromatography, nuclear magnetic resonance spectroscopy, and mass spectrometry. The major GM2 species contained the ceramides with d18:1-18:0 (40.5% of the total GM2 species), d20:1-18:0 (31%) and d18:1-20:0 (12%). We also found minor GM2 species with the ceramides with d18:1-24:1 (4%), d18:1-22:0 (2%) and d18:2-24:1 (1%), which have not been reported previously.
authors.affiliation: Department of Medical Chemistry, Biochemistry and Biotechnology, Center of Excellence on Neurodegenerative Diseases, University of Milan, Via Fratelli Cervi 93, 20090 Segrate, Italy.
authors.forename: Laura
authors.initials: L
authors.lastname: Mauri
authors.forename: Manuela
authors.initials: M
authors.lastname: Valsecchi
authors.forename: Riccardo
authors.initials: R
authors.lastname: Casellato
authors.forename: Su-Chen
authors.initials: SC
authors.lastname: Li
authors.forename: Yu-Teh
authors.initials: YT
authors.lastname: Li
authors.forename: Sandro
authors.initials: S
authors.lastname: Sonnino
mesh_terms: D002849:Chromatography, Gas; D002850:Chromatography, Gel / Q000379:methods*; D005678:G(M2) Ganglioside / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D058428:Silica Gel; D012822:Silicon Dioxide / Q000737:chemistry
chemical_list: D005678:G(M2) Ganglioside; D058428:Silica Gel; D012822:Silicon Dioxide