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Mass spectra of tocopherols
Author(s) -
Scheppele Stuart E.,
Mitchum Ronald K.,
Rudolph Charles J.,
Kinneberg Keith F.,
Odell George V.
Publication year - 1972
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/bf02532647
Subject(s) - chemistry , fragmentation (computing) , mass spectrum , ion , polyatomic ion , kinetic energy , mass spectrometry , hydrogen , cleavage (geology) , tocopherol , photochemistry , stereochemistry , organic chemistry , chromatography , antioxidant , materials science , physics , vitamin e , quantum mechanics , fracture (geology) , computer science , operating system , composite material
The mass spectra of α‐, β‐ and γ‐tocopherols ( I ) are characterized by the absence of numerous fragmentation processes. Ion intensities, but not the reaction pathways, are strongly dependent on temperature. Principal fragment ions are formed (a) by cleavage through the nonaromatic portion of the chromanol ring both with and without hydrogen transfer and (b) via loss of the isoprenoid side chain. For (a) occurring with hydrogen transfer, ion‐kinetic energies favor a tropylium ion structure for the daughter ion. Loss of ketene from the molecular ions of α‐ and β‐tocopherol acetates producing the molecular ion of the corresponding tocopherol is the dominant process.