Definition of Previtamin. Meaning of Previtamin. Synonyms of Previtamin

- Previtamin D3 is an intermediate in the production of cholecalciferol (vitamin D3). It is formed by the action of UV light, most specifically UVB light...
- substance that may be converted within the body to a vitamin. The term previtamin is a synonym. The term "provitamin" is used when it is desirable to label...
- conrotatory ring-opening electrocyclic reaction; the product is previtamin D3. Second, previtamin D3 spontaneously isomerizes to vitamin D3 (cholecalciferol)...
- ultraviolet UV-B rays in the sun light, 7-DHC is converted into vitamin D3 via previtamin D3 as an intermediate isomer. It is also found in the milk of several...
- light. Ergosterol (provitamin D2) found in these fungi is converted to previtamin D2 on UV exposure, which then turns into vitamin D2. As cultured mushrooms...
- of the vitamin precursor B-ring through a conrotatory pathway making previtamin D3 (pre-cholecalciferol). In a process which is independent of UV light...
- additive. Preparations of irradiated ergosterol containing a mixture of previtamin and vitamin D2 were called viosterol in the 1930s. Ergosterol powder is...
- influence of ultraviolet light on the skin, cholesterol is converted to previtamin D3 which spontaneously isomerizes to vitamin D3 (or cholecalciferol)....
- lumisterol to vitamin D2, where following an electrocyclic ring opening to previtamin D2, a methyl hydrogen shifts. Bicyclic nonatrienes also undergo [1,7]...
- Previtamin...