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Composition of tomatoes and tomato products in antioxidants (WG1) page 70
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RRR- α-tocopherol
β-tocopherol
γ-tocopherol
δ-tocopherol
α-tocotrienol
HO
H 3C
HO
HO
H3C
HO
HO
H 3C
Figure 13 : Main naturally occuring vitamin E compounds
7.3.1 Physico-chemical characteristics
- Molecular formula C29H50O2, Molecular weight 430.9 g/mol
- Slightly viscous, pale yellow oil.
- Natural α-tocopherol has been crystallized, its physical characteristics are :
mp 2.5-3.5°C, d 25 4 0.950 ; bp0.1 200-220°C ; n 25 d 1.5045
- λ max = 294 nm (E 1% 1cm = 71)
CH3
CH 3
CH3
CH 3
CH 3
CH 3
CH 3
CH 3
O
O
O
O
O
CH 3
CH 3
CH 3
CH 3
CH 3
H CH3 H CH3
CH3 - Solubility : practically insoluble in water. Highly soluble in oils, fats, acetone, alcohol,
chloroform, ether, other lipophilic solvents.
- E 0 (pH7) = 500 mV
CH 3
CH 3
CH 3
CH 3
CH 3
CH 3
CH 3
CH 3
CH 3
CH 3
CH 3
CH 3
CH 3
CH 3
CH3
CH 3
CH 3