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Vitamin E is a group of eight compounds related in molecular structure that includes four tocopherols and four tocotrienols. The tocopherols function as fat-soluble antioxidants which may help protect cell membranes from reactive oxygen species. Vitamin E is classified as an essential nutrient for humans.
The discovery of vitamin E by scientists Katherine Bishop and Herbert Evans in 1922 marked the beginning of the understanding of tocotrienols. [17] Vitamin E was named "tocopherol" (from the Greek words tokos, meaning childbirth, and phero, meaning to bring forth) due to its presumed role in aiding conception.
Elmer Verner McCollum (March 3, 1879 – November 15, 1967) was an American biochemist known for his work on the influence of diet on health. [2] [3] McCollum is also remembered for starting the first rat colony in the United States to be used for nutrition research.
For example, vitamin C can be synthesized by some species but not by others; it is not considered a vitamin in the first instance but is in the second. Most vitamins are not single molecules, but groups of related molecules called vitamers. For example, there are eight vitamers of vitamin E: four tocopherols and four tocotrienols.
Tocopherols (/ t oʊ ˈ k ɒ f ə ˌ r ɒ l /; [1] TCP) are a class of organic compounds comprising various methylated phenols, many of which have vitamin E activity. Because the vitamin activity was first identified in 1936 from a dietary fertility factor in rats, it was named tocopherol, from Greek τόκος tókos 'birth' and φέρειν phérein 'to bear or carry', that is 'to carry a ...
Vitamin E is first isolated in a pure form by Gladys Anderson Emerson at the University of California, Berkeley. [3] Eastman Kodak first market Kodachrome subtractive color reversal film as 16 mm movie film. [4] [5] It has been invented by two professional musicians, Leopold Godowsky Jr. and Leopold Mannes. [6] [7] [8]
In 1911, the egg carton was invented by Joseph Coyle in Smithers, British Columbia, ... Vitamin E: 7%. 1.03 mg: Vitamin K: 0%. 0.3 μg: Minerals: Quantity %DV ...
In 1922 along with Katharine Scott Bishop, during feeding experiments on rats, he co-discovered Vitamin E which is needed for human reproduction. [5] Evans became director of the Institute of Experimental Biology at Berkeley in 1931. With Gladys Anderson Emerson, he reported the isolation of the pure Vitamin E from wheat germ in 1937.