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100
M + -259
259
219
CH 3
M +
424
165
HO
H 3 C
O
CH 3
MW 424
50
69
M + -219
205
220
0
75
125
175
225
m/z
275
325
375
425
100
M + -259
259
219
151
HO
M +
410
H 3 C
O
CH 3
MW 410
50
69
M + -219
191
206
0
80
120
160
200
240
m/z
280
320
360
400
FIGURE 12.9
The mass spectra of vitamin E compounds showing typical fragmentation.
HISTORICAL NOTE
Vit E was first described in 1922. It was isolated from wheat germ and named
α- tocopherol. Subsequently, β- tocopherol and γ-tocopherol were separated
from vegetable oils. Vit  E was first used on preemies (babies born prema-
turely) who suffered from growth failure, and after supplementation most
infants recovered and were able to resume normal growth. In adults, Vit E is
a required nutrient with antioxidant benefits and one role may be to prevent
oxidative damage caused during lipid peroxidation.
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