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Encyclopedia > Xanthophyll

Xanthrophylls (originally phylloxanthins) are yellow pigments of oxycarotenoid type, from the carotenoid group. They are found in the leaves of most plants and are synthesized within the plastids. They are involved in photosynthesis along with green chlorophyll, which typically covers up the yellow except in autumn, when the chlorophyll decomposes. For animal and plant pigments, see Pigment, biology. ... Carotenoids are organic pigments that are naturally occurring in plants and some other photosynthetic organisms like algae, some types of fungus and some bacteria. ... Leaves are an Icelandic five-piece alternative rock band who came to prominence in 2002 with their debut album, Breathe, drawing comparisons to groups such as Coldplay and Doves. ... u fuck in ua ... Plastids are major organelles found in plants and algae. ... The leaf is the primary site of photosynthesis in plants. ... Green is a color with many different shades, all within a wavelength of roughly 520–570 nm. ... Chlorophyll is a green photosynthetic pigment found in plants, algae, and cyanobacteria. ... Fall redirects here. ...


In plants, xanthophylls are considered accessory pigments, along with anthocyanins, carotenes, and sometimes phycobiliproteins. Xanthophylls, along with carotenic pigments are seen when leaves turn orange in the autumn season. An accessory pigment is a pigment other than chlorophyll found in plants, such as a carotenoid, that serves the function of absorbing light energy, and transfering it to chlorophyll. ... Plants with abnormally high anthocyanin quantities are popular as ornamental plants - here, a selected purple-leaf cultivar of European Beech Anthocyanins (from Greek: (anthos) = flower + (kyanos) = blue) are water-soluble vacuolar flavonoid pigments that appear red to blue, according to pH. They are synthesized exclusively by organisms of the plant... Carotene is responsible for the orange colour of the carrots and many other fruits and vegetables. ... Phycobiliproteins are water-soluble proteins present in cyanobacteria and certain algae (rhodophytes, cryptomonads, glaucocystophytes) that capture light energy which is then passed on to chlorophylls during photosynthesis. ...


Animals cannot produce xanthophylls, and thus xanthophylls found in animals (e.g. in the eye) come from their food intake. The yellow color of chicken egg yolks also comes from ingested xanthophylls. Phyla Placozoa (trichoplax) Orthonectida (orthonectids) Rhombozoa (dicyemids) Subregnum Parazoa Porifera (sponges) Subregnum Eumetazoa Radiata (unranked) (radial symmetry) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anemones) Bilateria (unranked) (bilateral symmetry) Acoelomorpha (basal) Myxozoa (slime animals) Superphylum Deuterostomia (blastopore becomes anus) Chordata (vertebrates, etc. ... In most birds and reptiles, an apple (Latin ovum) is the zygote, resulting from fertilization of the ovum. ... The egg yolk is the yellow inside an egg. ...


Xanthophylls are oxidized derivatives of carotenes. They contain hydroxyl groups and are more polar; therefore, they are the pigments that will travel the most in paper chromatography. Carotene is responsible for the orange colour of the carrots and many other fruits and vegetables. ... Hydroxide is a functional group consisting of oxygen and hydrogen: -O−H It has a charge of 1-. The term hydroxyl group is used when the functional group -OH is counted as a substituent of an organic compound. ... A commonly-used example of a polar compound is water (H2O). ... Paper chromatography is an analytical technique for separating and identifying compounds that are or can be colored, especially pigments. ...


The group of xanthophylls is composed of lutein, zeaxanthin, and α- and β-cryptoxanthin. Lutein (LOO-teen) is one of over 600 known naturally occurring carotenoids. ... Zeaxanthin is one of the two carotenoids contained within the retina. ...


  Results from FactBites:
 
Process for the formation, isolation and purification of comestible xanthophyll crystals from plants - Patent 5648564 (3918 words)
Xanthophylls are typically present in plant chromoplasts as long chain fatty esters, typically diesters, of acids such as palmitic and myristic acids.
According to the present invention, a xanthophyll, preferably lutein, zeaxanthin or capsanthin and capsorubin is formed, isolated and purified from xanthophyll diester-containing plant matter, preferably a plant known to contain high concentrations of the desired xanthophyll diester.
The xanthophyll esters are extracted from the plant, preferably from the flower, fruit or root, with an appropriate organic solvent or a mixture of solvents that are themselves readily removable from the extract.
Xanthophyll Summary (476 words)
Xanthophylls are present in two large protein-cofactor complexes, present in photosynthetic membranes of organisms using Photosystem I or Photosystem II.
Xanthophylls (originally phylloxanthins) are yellow pigments of oxycarotenoid type, from the carotenoid group.
The group of xanthophylls is composed of lutein, zeaxanthin, and α- and β-cryptoxanthin.
  More results at FactBites »


 

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