carotene


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Related to carotene: alpha carotene

carotene

 [kar´o-tēn]
a yellow or red pigment found in many dark green, leafy, and yellow vegetables such as collards, turnips, carrots, sweet potatoes, and squash, as well as in yellow fruit, milk, egg yolk, and body fat; it is a chromolipoid hydrocarbon existing in four forms (α-, β-, γ-, and δ-carotene), which can be converted into vitamin A in the body.
beta carotene
1. the β isomer of carotene.
2. a preparation of this substance administered orally to prevent vitamin A deficiency and to reduce photosensitivity in patients with erythropoietic protoporphyria. Written also betacarotene and β-carotene.

car·o·tene

(kar'ō-tēn),
A member of a class of carotenoids, yellow-red pigments (lipochromes) widely distributed in plants and animals, notably in carrots, and closely related in structure to the xanthophylls and lycopenes and to the open-chain squalene; of particular interest in that they include precursors of the vitamins A (provitamin A carotenoids). Chemically, they consist of 8 isoprene units in a symmetric chain with the 2 isoprenes at each end cyclized, forming either α-carotene or β-carotene (γ-carotene has only one end cyclized). The cyclic ends of β-carotene are identical β-ioninelike structures; thus, on oxidative fission, β-carotene yields 2 molecules of vitamin A. The cyclic ends of α-carotene differ in that one is an α-ionone and the other a β-ionone; on fission, α-carotene, like γ-carotene, yields 1 molecule of vitamin A (a β-ionone derivative).

carotene

(kăr′ə-tēn′) also

carotin

(-tĭn)
n.
An orange-yellow to red crystalline pigment, C40H56, found in animal tissue and certain plants, such as carrots and squash. It exists in several isomeric forms and is converted to vitamin A in the liver.

car·o·tene

(kar'ō-tēn)
Yellow-red pigments (lipochromes) widely distributed in plants and animals, notably in carrots, and closely related in structure to the xanthophylls and lycopenes and to the open-chain squalene; they include precursors of vitamin A (provitamin A carotenoids).

carotene

One of a group of orange pigments found in carrots and some other vegetables. Beta-carotene (provitamin A) is converted to vitamin A in the liver. This vitamin is needed for normal growth and development of bone and skin, for the development of the fetus and for the proper functioning of the RETINA.

carotene

an orange plant pigment of the CAROTENOID group which is usually present in the CHLOROPLASTS, and sometimes occurs in pigment-containing structures called CHROMOPLASTS which are found in yellow/orange leaves, vegetables and fruits. Carotene is also found in green leaves but the colour is masked; the orange colour can be seen in autumn leaves as the chlorophylls break down first. Carotene is necessary for the production of vitamin A in man and has an ABSORPTION SPECTRUM of about 450 nm. Carotene acts as an accessory pigment, passing energy to chlorophyll a for use in LIGHT REACTIONS and protecting chlorophyll from excessive light, and from oxidation by the oxygen produced in PHOTOSYNTHESIS.

car·o·tene

(kar'ō-tēn)
Yellow-red pigments widely distributed in plants and animals, notably in carrots; include precursors of vitamin A.
References in periodicals archive ?
From our work it could be suggested that beta- carotene act as a potential antioxidative agent which could improve AFB1 induced oxidative stress resulting apoptosis.
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The analytic imprecision of this carotene assay is 6.6% at levels of 96.6 [micro]g/dL (1.8 [micro]mol/L) and 155.7 [micro]g/dL (2.9 [micro]mol/L).
Statistical design and monitoring of the Carotene and Retinol Efficacy Trial (CARET).
The investigators concluded that "an above-median intake of the combination of vitamins C and E, beta carotene, and zinc was associated with a 35 percent lower risk of incident AMD."
Your body changes beta carotene into a form of vitamins A.
"As beta carotene has clearly no benefit and even a hint of possible harm, I can see no reason that people should take it," comments National Cancer Institute director Richard Klausner.
It packs higher levels of beta carotene, five parts per million on average, than a regular cucumber's one ppm.
Scientists were surprised and reporters dumbfounded--or else gleeful at the prospect of shocking headlines--by the recently published results of a Finnish study on beta carotene and vitamin E.
Of these nutrients, beta carotene has received the most attention of late, and some manufacturers of dietary supplements containing beta carotene have been promoting these products as possible cancer preventives.
According to new report available with Million Insights, the global beta carotene industry report on is foretold to provide a robust support for market players to lay a solid foundation for their business growth.
[USPRwire, Thu Aug 01 2019] Rising use of carotene as a viable food additive is boosting the growth trajectory of carotene market.