Provitamin


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Related to Provitamin: Prooxidant, provitamin A carotenoids

provitamin

[prō′vīd·ə·mən]
(biochemistry)
A vitamin precursor; assumes vitamin activity upon activation or chemical change.

Provitamin

 

a biochemical precursor of a vitamin. Provitamin A (carotene), which is synthesized by plant cells, forms the A vitamins in animal cells. Ergosterol and its derivatives form the calciferols, the D vitamins.

References in periodicals archive ?
The bananas were developed by taking genes from a species of banana from Papua New Guinea, which is high in provitamin A but produces only small bunches, and combining it with a Cavendish banana, the high-yielding common banana species.
After ingestion, four units of provitamin A carotenoids are converted to one unit of absorbed retinol (2); bioavailability, therefore, is 25% (Term D).
Pathenol is a natural hydrating form of VitaminB, a nontoxic provitamin with remarkable absorption properties rendering it an excellent moisturiser and emollient.
Editor's Note: "These results suggest carotenoids may inhibit tumor initiation, which is compatible with hypothesized mechanisms, including the conversion of provitamin A carotenoids to retinol, which regulates cell growth, differentiation, and apoptosis, and the antioxidant capacity to scavenge reactive oxygen species and prevent DNA damage," stated authors Heather Eliassen of Harvard University and colleagues.
Vitamin and Provitamin Market in Czech Republic to 2018 - Market Size, Trends, and Forecasts
Improves elasticity and reduces visible signs of ageing with Provitamin B5, soy and a special collagen-booster with SPF20.
Glutax 5GS kit contained Glutathione 500 mg + Alpha Lipoic Acids 200 mg (Glutax 5GS) powder for injection in a glass vial; Vitamin E 300 mg + ProVitamin B3 250 mg + ProVitamin B5 100 mg (Glutax 5GS) solution for injection in a glass ampule and ascorbic acid 1500mg/Collagen extract 350 mg solution for injection, also in a glass ampule, said the FDA.
Conventional breeding is used to increase the level of zinc iron and provitamin A carotenoids in staple foods.
ISLAMABAD -- A fresh avocado when added to a tomato sauce or raw carrot meal promotes conversion of provitamin A (inactive vitamin form) to vitamin A (active vitamin form), says a study.
Carrots contain beta-carotene, also known as provitamin A, not preformed vitamin A.
This means that both melons appear to be comparable sources of dietary provitamin A for humans, on par with carrots, which are known to be a major source of provitamin A.
Genetically modified organisms (GMOs) are now used in the production of pharmaceutical drugs, gene therapy, and golden rice (containing provitamin A).