carotene


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Related to carotene: alpha carotene

carotene

(kâr`ətēn'), long-chained, unsaturated hydrocarbon found as a pigment in many higher plants, particularly carrots, sweet potatoes, and leafy vegetables. Carotene is thought to assist in trapping light energy for photosynthesisphotosynthesis
, process in which green plants, algae, and cyanobacteria utilize the energy of sunlight to manufacture carbohydrates from carbon dioxide and water in the presence of chlorophyll. Some of the plants that lack chlorophyll, e.g.
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 or to aid in chemical reduction. It is important in animal biology as the main dietary source of vitamin A (see vitaminvitamin,
group of organic substances that are required in the diet of humans and animals for normal growth, maintenance of life, and normal reproduction. Vitamins act as catalysts; very often either the vitamins themselves are coenzymes, or they form integral parts of coenzymes.
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), which is produced by splitting one molecule of carotene into two molecules of vitamin A. Carotene that is thus converted is called provitamin A. This reaction occurs in either the liver or intestinal wall. The absorption of dietary carotene is dependent on the action of bile. Its absorption is less efficient than that of vitamin A. High intake of dietary carotene is being studied for its disease prevention potential. Carotenes are the simplest of a group of natural pigments called carotenoids, of which there are more than 600.

carotene

[′kar·ə‚tēn]
(biochemistry)
C40H56 Any of several red, crystalline, carotenoid hydrocarbon pigments occurring widely in nature, convertible in the animal body to vitamin A, and characterized by preferential solubility in petroleum ether. Also known as carotin.

carotene

, carotin
any of four orange-red isomers of an unsaturated hydrocarbon present in many plants (β-carotene is the orange pigment of carrots) and converted to vitamin A in the liver. Formula: C40H56
References in periodicals archive ?
In the case of determining the content of carotenes in cooked food, a coupled HPLC method was employed [19] with UV-Vis spectrophotometric detection at the wavelength of 470 nm.
In beta- carotene group the number of cells and their morphology was better than the control group.
Conclusion: Beta carotene has protective role on histomorphology of kidneys in subacute APAP-induced renal damage in rats.
Serum carotene was then extracted with petroleum ether and analyzed using spectrophotometry at a wavelength of 440 nm.
Furthermore, there is new concern that high-dose antioxidant supplementation, including beta carotene, may have adverse health consequences including mortality," Dr.
The effect of vitamin E and beta carotene on the incidence of lung and other cancers in male smokers.
The antioxidant nutrients that comprised the study index were lutein, zeaxanthin, alpha carotene, beta carotene, beta cryptoxanthin, lycopene, vitamins C and E, zinc, and selenium.
It is high in fiber, calcium, iron, beta carotene (vitamin A), and vitamin E.
The report showed that the incidence of some types of cancer, particularly lung cancer, was lower in populations consuming higher levels of dietary carotenoids, which could not be explained by the well-known function of [beta] carotene as a source of vitamin A.
The Carotene plus research team has succeeded in modifying rice by genetic engineering to make it produce a-carotene (provitamin A) which is converted to vitamin A by humans.
Vegetables and fruits that are high in beta carotene (Bay-tuh KARE-uh-teen) can improve your vision.
NEW YORK - Two studies on the efficacy and safety of beta carotene recently completed by the National Cancer Institute have touched off a vigorous debate.