title: Determination of tocopherols, tocopherolquinones and tocopherolhydroquinones by gas chromatography-mass spectrometry and preseparation with lipophilic gel chromatography.
abstract: Lipophilic gel chromatography using Sephadex LH-20 helps in separating alpha-, beta- + -gamma, and delta-tocopherol and also in separation of their oxidation products e.g. the tocopherolquinones or other oxidation products. This preseparation can help to overcome analytical problems due to the complexity of synthesis mixtures of tocopherol oxidation procedures as well as in separation of complex physiological matrices. Determination of the preseparated tocopherols, tocopherolquinonesand tocopherolhydroquinones can then be achieved by means of GC-MS measurement of the free substances or their trimethylsilyl derivatives.
authors.affiliation: Robert Koch-Institute, Bereich Tempelhof, General-Pape-Straase 62-66, D-12101 Berlin, Germany. melcherth@rki.de
authors.forename: H U
authors.initials: HU
authors.lastname: Melchert
authors.forename: D
authors.initials: D
authors.lastname: Pollok
authors.forename: E
authors.initials: E
authors.lastname: Pabel
authors.forename: K
authors.initials: K
authors.lastname: Rubach
authors.forename: H J
authors.initials: HJ
authors.lastname: Stan
mesh_terms: D002850:Chromatography, Gel / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D015203:Reproducibility of Results; D024505:Tocopherols / Q000032:analysis*; D014810:Vitamin E / Q000031:analogs & derivatives* / Q000032:analysis*
chemical_list: D014810:Vitamin E; C002421:tocopherylquinone; D024505:Tocopherols