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Vitamin A |
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A fat-soluble vitamin essential for growth and bone development in children, for vision, for healthy skin and mucous membrane surfaces, for reproduction and the integrity of the immune system. |
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| Author: Douglas |
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Early in the 20th century, Englishman Frederick Gowland Hopkins discovered a growth-stimulating substance inn milk. Later, a German researcher named Stepp identified a substance he had labeled “minimal qualitative factors” as a lipid. In 1913, E. V. McCollum and Marquerite David demonstrated an essential growth factor for rats in butter and egg yolk, which they called “fat soluble A.”
Simultaneously, Osborn and Mendel, working in New Haven, Connecticut, found a similar fat soluble substance in cod-liver oil and butter.
Moore, an English scientist, demonstrated that beta-carotene obtained as a colored substance from plants was transformed in the human body to a colorless form of vitamin A, which was then stored in the liver. It was not until 1930 that Karrer and his group in Switzerland determined the chemical structures of vitamin A and beta-carotene. In 1935, Wald defined a biochemical in the retina that he termed retinene, later renamed retinal.
About Author
Douglas Adams is the owner of http://www.allwellbeing.com , a website dedicated to increasing knowledge of health related issues.
http://www.shaklee.net/douglas_adams For high quality health care products
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