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- Carotenoid abstract "Carotenoids are organic pigments that are found in the chloroplasts and chromoplasts of plants and some other photosynthetic organisms, including some bacteria and some fungi. Carotenoids can be produced from fats and other basic organic metabolic building blocks by all these organisms. Carotenoids generally cannot be manufactured by species in the animal kingdom so animals obtain carotenoids in their diets, and may employ them in various ways in metabolism.There are over 600 known carotenoids; they are split into two classes, xanthophylls (which contain oxygen) and carotenes (which are purely hydrocarbons, and contain no oxygen). All carotenoids are tetraterpenoids, meaning that they are produced from 8 isoprene molecules and contain 40 carbon atoms. Carotenoids in general absorb blue light. They serve two key roles in plants and algae: they absorb light energy for use in photosynthesis, and they protect chlorophyll from photodamage. In humans, three carotenoids (beta-carotene, alpha-carotene, and beta-cryptoxanthin) have vitamin A activity (meaning they can be converted to retinal), and these and other carotenoids can also act as antioxidants. In the eye, certain other carotenoids (lutein, astaxanthin and zeaxanthin) apparently act directly to absorb damaging blue and near-ultraviolet light, in order to protect the macula of the retina, the part of the eye with the sharpest vision.People consuming diets rich in carotenoids from natural foods, such as fruits and vegetables, are healthier and have lower mortality from a number of chronic illnesses. Although a recent meta-analysis of 68 reliable antioxidant supplementation experiments involving a total of 232,606 individuals concluded additional β-carotene from supplements is unlikely to be beneficial and may actually be harmful, this may be due to the inclusion of studies involving smokers - β-carotene under intense oxidative stress (e.g. induced by heavy smoking) gives breakdown products that reduce plasma vitamin A and worsen the lung cell proliferation induced by smoke. With the notable exception of the gac fruit and crude palm oil, most carotenoid-rich fruits and vegetables are low in lipids. Since dietary lipids have been hypothesized to be an important factor for carotenoid bioavailability, a 2005 study investigated whether addition of avocado fruit or oil, as lipid sources, would enhance carotenoid absorption in humans. The study found that the addition of both avocado fruit and oil significantly enhanced the subjects' absorption of all carotenoids tested (α-carotene, β-carotene, lycopene, and lutein).".
- Carotenoid thumbnail Grand_prismatic_spring.jpg?width=300.
- Carotenoid wikiPageExternalLink caroten.htm.
- Carotenoid wikiPageExternalLink carotenoids.
- Carotenoid wikiPageExternalLink www.carotenoidsociety.org.
- Carotenoid wikiPageExternalLink news_summ.jsp?cntn_id=116842&WT.mc_id=USNSF_52&WT.mc_ev=click.
- Carotenoid wikiPageID "294943".
- Carotenoid wikiPageRevisionID "606033578".
- Carotenoid hasPhotoCollection Carotenoid.
- Carotenoid subject Category:Bioindicators.
- Carotenoid subject Category:Carotenoids.
- Carotenoid subject Category:Photosynthesis.
- Carotenoid comment "Carotenoids are organic pigments that are found in the chloroplasts and chromoplasts of plants and some other photosynthetic organisms, including some bacteria and some fungi. Carotenoids can be produced from fats and other basic organic metabolic building blocks by all these organisms.".
- Carotenoid label "Carotenoid".
- Carotenoid label "Carotenoide".
- Carotenoid label "Carotenoide".
- Carotenoid label "Carotenoidi".
- Carotenoid label "Carotenoïde".
- Carotenoid label "Carotinoide".
- Carotenoid label "Caroténoïde".
- Carotenoid label "Karotenoidy".
- Carotenoid label "Каротиноиды".
- Carotenoid label "كاروتينات".
- Carotenoid label "カロテノイド".
- Carotenoid label "類胡蘿蔔素".
- Carotenoid sameAs Karotenoidy.
- Carotenoid sameAs Carotinoide.
- Carotenoid sameAs Καροτενοειδές.
- Carotenoid sameAs Carotenoide.
- Carotenoid sameAs Karotenoide.
- Carotenoid sameAs Caroténoïde.
- Carotenoid sameAs Karotenoid.
- Carotenoid sameAs Carotenoidi.
- Carotenoid sameAs カロテノイド.
- Carotenoid sameAs 카로티노이드.
- Carotenoid sameAs Carotenoïde.
- Carotenoid sameAs Karotenoidy.
- Carotenoid sameAs Carotenoide.
- Carotenoid sameAs m.01r2vj.
- Carotenoid sameAs Q191907.
- Carotenoid sameAs Q191907.
- Carotenoid wasDerivedFrom Carotenoid?oldid=606033578.
- Carotenoid depiction Grand_prismatic_spring.jpg.
- Carotenoid isPrimaryTopicOf Carotenoid.