a-tocopherol degradation products

[key4]

Anybody can help me to found/built a list of a-tocopherol degradation/oxidation products??
as I know there is a lot depending on the metal complex/ions/... but I´m looking only the most relevant.

tks
k4

[key4]

ok , let me update this,
as I found in www there is some "clasical" compounds
(Daniel C. Lieber 1993)
a-hydroperoxitocopherone
a-tocopherylquinone
2,3-epoxy-a-tocopherylquinone
and 5,6-epoxy-a-tocopherolquinone.

now since this in based on biological systems, rather than pharma systems, I´m trying to confirm structures by ms/ms...
to be continue....