title: A liquid chromatography/tandem mass spectrometric approach for the determination of gangliosides GD3 and GM3 in bovine milk and infant formulae.
abstract: A liquid chromatographic/tandem mass spectrometric method using pneumatically assisted electrospray ionisation (LC/ESI-MS/MS) was developed for the determination of gangliosides GD3 and GM3 in milk and infant formulae. The gangliosides were extracted in a chloroform/methanol/water environment and cleaned up by solid-phase extraction (SPE) on an end-capped C8 sorbent. The gangliosides were detected in negative ion mode after separation on a reversed-phase (RP) C5 analytical column. From the different ganglioside molecular species, product ions at m/z 290 corresponding to an N-acetylneuraminic acid fragment were produced in the collision cell and used in selected reaction monitoring. A standard addition technique was applied for quantification. The relative repeatability standard deviations were less than 5% for GD3 (level 10 mg/L) and 14% for GM3 (level 0.1-0.2 mg/L).
authors.affiliation: Steins Laboratorium, Blomstervej 1, 8381 Tilst, Denmark. lks@steins.dk
authors.forename: Lambert K
authors.initials: LK
authors.lastname: Sørensen
mesh_terms: D000818:Animals; D002417:Cattle; D005591:Chemical Fractionation / Q000379:methods; D002853:Chromatography, Liquid / Q000379:methods*; D005504:Food Analysis / Q000379:methods*; D005679:G(M3) Ganglioside / Q000032:analysis*; D005732:Gangliosides / Q000032:analysis*; D041943:Infant Formula / Q000737:chemistry*; D008892:Milk / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D005679:G(M3) Ganglioside; D005732:Gangliosides; C026226:ganglioside, GD3