Unique among the plant kingdom, annatto produces only tocotrienols, whereas all other known sources of this vitamin E nutrient, such as palm and rice, deliver mixtures of tocopherols and tocotrienols, typically containing anywhere from 25-50% alpha-tocopherol
Natural sources with the highest amounts of alpha-tocopherol
include wheat germ, nuts and seeds (particularly sunflower seeds and almonds), and vegetable oils, such as wheat germ and sunflower oils.
According to a standard assay (the rat fetal resorption assay), alpha-tocopherol
has the highest biological activity of the four tocopherols, and it is the only form of vitamin E that is officially recognized as being capable of meeting human requirements.
Harri Hemila analyzed data from the Alpha-Tocopherol
, Beta-Carotene (ATBC) Cancer Prevention Study conducted in Finland from 1985-1993.
8) Most topical formulations contain synthetic laboratory-made alpha-tocopherol
or one of its many esters or ethers.
Determination of alpha-tocopherol
in tissues and plasma by high-performance liquid chromatography.
Stocker, "Cosupplementation with coenzyme Q prevents the prooxidant effect of alpha-tocopherol
and increases the resistance of LDL to transition metal-dependent oxidation initiation," Arteriosclerosis, Thrombosis, and Vascular Biology, vol.
The other form of Vitamin E, alpha-tocopherol
, which is found in olive and sunflower oils, does the opposite.
Effect of dietary levels of vitamin E (all-rac-tocopheryl acetate) with or without added fat on weanling pig performance and tissue alpha-tocopherol
The new finding came as previous studies investigating the link between vitamin E and memory disorders usually focused only on a single form of vitamin E, namely alpha-tocopherol
Detection of topically applied alpha-tocopherol
in vitreous Reagents and Chemicals
Indeed the few studies, which have reported on the tocopherol concentration in adzuki beans all reported negligible concentrations of alpha-tocopherol
and beta-tocopherol (Yoshida et al.