carotenoids


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ca·rot·e·noids

(ka-rot'e-noydz),
Generic term for a class of carotenes and their oxygenated derivatives (xanthophylls) consisting of 8 isoprenoid units (thus, tetraterpenes) joined so that the orientation of these units is reversed at the center, placing the two central methyl groups in a 1,6 relationship in contrast to the 1,5 of the others. All carotenoids may be formally derived from the acyclic C40H56 structure known as lycopene, with its long central chain of conjugated double bonds by hydrogenation, dehydrogenation, oxidation, cyclization, or combinations of these. Included as carotenoids are some compounds arising from certain rearrangements or degradations of the carbon skeleton, but not retinol and related C20 compounds. The nine-carbon end groups may be acyclic with 1,2 and 5,6 double bonds or cyclohexanes with a single double bond at 5,6 or 5,4 or cyclopentanes or aryl groups; these are now designated by Greek letter prefixes preceding "carotene" (α and δ, which are used in the trivial names α-carotene and δ-carotene, are not used for that reason). Suffixes (for example, -oic acid, -oate, -al, -one, -ol) indicate certain oxygen-containing groups (for example, acid, ester, aldehyde, ketone, alcohol); all other substitutions appear as prefixes (for example, alkoxy-, epoxy-, hydro-). ). The configuration about all double bonds is trans unless cis and locant numbers appear. The prefix retro- is used to indicate a shift of one position of all single and double bonds; apo- indicates shortening of the molecule. Many carotenoids have anticancer activities.

ca·rot·e·noids

(kă-rot'ĕ-noydz)
Generic term for a class of carotenes and their oxygenated derivatives (xanthophylls).

carotenoids

A large group of yellow or orange pigments occurring in plants some of which have antioxidant properties. Some of the carotenoids are carotenes.

carotenoids

a group of yellow/orange pigments found in plants, animals and microorganisms, which includes CAROTENES (orange) and xanthophylls (yellow).

Carotenoids

Carotenoids are yellow to deep-red pigments.
Mentioned in: Vitamin A Deficiency

carotenoids (k·rˑ·te·noidz),

n.pl fat-soluble plant pigments whose functions include photosynthesis, providing bright coloration (red, orange, and yellow), and protecting from light and oxygen (antioxidants). In humans, carotenoids are useful as an-tioxidants (compounds which prevent tissue damage and degeneration). See also beta-carotene, lutein, and lycopene.
References in periodicals archive ?
In other words, carotenoids produce color patches, whereas melanins produce intricate patterns
Carotenoids are known to have a positive role in the intermediary metabolism of fish (Tacon, 1981; Segner et al.
The loss of carotenoids in dried orange sweet potato stored at ambient temperature was 70-80% after 4 months under field conditions in Uganda and Mozambique [4,8], a finding in agreement with the model prediction [14].
On the basis of type, carotenoids are segmented into astaxanthin, beta-carotene, lutein, lycopene, canthaxanthin, and zeaxanthin.
The main aim of this study was therefore to determine the oil extraction yield and total carotenoids in the soft parts of sea buckthorn seed grown in Mongolia.
The Age-Related Eye Disease Study (AREDS), conducted by the National Institutes of Health's National Eye Institute, examined the effects of a "cocktail" of carotenoids and other vitamins and minerals linked to eye health (see "The Best Eye Health Supplements") on the risk of cataracts and advanced AMD.
The project has shown that including corn distiller's oil in poultry rations helps in providing carotenoid pigments to the birds, giving added value.
In 2009, a number of BC patients (n = 71) were randomly recruited among the patients enrolled at the Centre of Palermo, aged 36 to 74, nonsmokers, accepted with informed consent, and who were to be examined for body redox status, and were invited for RRS measurement of skin carotenoids (skin carotenoid score (SCS)), as an index of oxidative stress.
Now research has discovered that eggs may be the best way to extract carotenoids from veggies.
Exciting research indicates that the avocado's rich content of carotenoids, fatty acids, and other nutrients promote joint, eye, and skin health and help prevent cancer, cardiovascular disease, metabolic syndrome, and obesity.