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New form of vitamin E discovered Summer 2009, Vol 5, Issue 16 
With their discovery of a δ-tocomonoenol, a new form of
vitamin E, researchers in this featured study contribute
to the growing body of literature on the compilation of
vitamin E isomers and their collective capacity to act as
free-radical scavengers and antioxidants. There are two
groups of vitamin E: tocopherols - of which δ-tocomonoenol
is an analogue - and tocotrienols; there are four tocopherols -
alpha, beta, gamma, delta; and four tocotrienols - alpha, beta,
gamma, delta. All forms of vitamin E have demonstrated to have
varying levels of antioxidant activity via the scavenging of free
radicals and/or the delay or inhibition of lipid oxidation.Fiorentino et al highlight the body of literature focusing on the essential role such food antioxidants have in the reduction of chronic disease risk and improvement in overall health and wellbeing. They point out the significant damage caused to biological membranes by reactive radical species, and the fact that the human physiology's innate defense is not sufficient to scavenge free radicals or inhibit oxidation. Humans, for instance, do not synthesize vitamin E. In this feature study δ-tocomonoenol was isolated from kiwi fruit; predominantly found in the peel and to a lesser extent in the pulp. Researchers first describe their methods of isolating and elucidating the structure of δ-tocomonoenol, and second, give their assessment of δ-tocomonoenol's total antioxidant capacity. After peels of kiwi were dried in a ventilated incubator overnight an "extract was chromatographed on silica gel and eluted." In addition to α-tocopherol and δ-tocopherol, researchers identified a new form of vitamin E (δ-tocomonoenol) based on its spectroscopic features and molecular formula analysis. Five different methods were used to assess the antioxidant capacities of all three compounds. It was discovered that the antioxidant capacities of δ-tocomonoenol and δ-tocopherol were very similar. One measurement assessed each compound's capacity to scavenge DPPH (2,2'-diphenyl-1-picrylhydrazyl radical) and anion superoxide free radical. Researchers found δ-tocomonoenol reduced the former by 24%, and the latter by 29.2%. Moreover, all three compounds inhibited a lipoperoxidative process, showing a significant reduction in the formation of conjugated diene hydroperoxides from methyl linoleate: α-tocopherol (33%) δ-tocomonoenol (27%), and δ-tocopherol (25.5%). Fiorentino et al conclude highlighting several studies suggesting regular dietary intake of vitamin E decreases the risk of prostate, colon and lung cancers. They acknowledge plant foods as the main source of dietary vitamin E, and in this case, their findings identify a new tocopherol analogue which contributes to the total antioxidant activity of kiwi fruit. Study: Fiorentino, A, et al, Food Chemistry, 187-192, (2009) UH Issue: Summer 2009, Vol 5, Number 16 For Clinicians: Related Innate Response Formulas Complete 8 Vitamin E: Provides all Isomers of Vitamin E A whole plant extraction of palm fruit delivering all tocopherols and tocotrienols, which collectively constitute vitamin E. None of the palm fruit's naturally occurring constituents, including phytosterols, squalene and carotenoids, are removed during the extraction process resulting in a 100% whole food vitamin E extract. Complete 8 Vitamin E provides complete antioxidant activity and whole plant nutriment. Click here to learn more. Return from vitamin e review |
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