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"Lutein (/\u02c8lu\u02d0ti\u02d0.\u1d7bn/ or /\u02c8lu\u02d0ti\u02d0n/; from Latin luteus meaning \"yellow\") is a xanthophyll and one of 600 known naturally occurring carotenoids. Lutein is synthesized only by plants and like other xanthophylls is found in high quantities in green leafy vegetables such as spinach, kale and yellow carrots. In green plants, xanthophylls act to modulate light energy and serve as non-photochemical quenching agents to deal with triplet chlorophyll (an excited form of chlorophyll), which is overproduced at very high light levels, during photosynthesis. See xanthophyll cycle for this topic.
Lutein is obtained by animals directly or indirectly, from plants. Lutein is apparently employed by animals as an antioxidant and for blue light absorption. Lutein is found in egg yolks and animal fats. In addition to coloring yolks, lutein causes the yellow color of chicken skin and fat, and is used in chicken feed for this purpose. The human retina accumulates lutein and zeaxanthin. The latter predominates at the macula lutea while lutein predominates elsewhere in the retina. There, it may serve as a photoprotectant for the retina from the damaging effects of free radicals produced by blue light. Lutein is isomeric with zeaxanthin, differing only in the placement of one double bond.
The principal natural stereoisomer of lutein is (3R,3\u2032R,6\u2032R)-beta,epsilon-carotene-3,3\u2032-diol. Lutein is a lipophilic molecule and is generally insoluble in water. The presence of the long chromophore of conjugated double bonds (polyene chain) provides the distinctive light-absorbing properties. The polyene chain is susceptible to oxidative degradation by light or heat and is chemically unstable in acids.
Lutein is present in plants as fatty-acid esters, with one or two fatty acids bound to the two hydroxyl-groups. For this reason, saponification (de-esterfication) of lutein esters to yield free lutein may yield lutein in any ratio from 1
Lutein is called a carotenoid vitamin. It is related to beta-carotene and vitamin A. Foods rich in lutein include broccoli, spinach, kale, corn, orange pepper, kiwi fruit, grapes, orange juice, zucchini, and squash. Lutein is absorbed best when it is taken with a high-fat meal.;Labeled Lutein, intended for use as an internal standard for the quantification of Lutein by GC- or LC-mass spectrometry.
Richer S (January 1999); Richer S, Stiles W, Statkute L, et al. (April 2004)
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This page contains information about Lutein-13C40 Cas # 282090-23-7 and its Stable Isotopes.
Lutein-13C40 Lutein-13C40 Worldwide Suppliers of Lutein-13C40 https://www.clearsynth.com/en/CSO11224.html Stable Isotopes Clearsynth 282090-23-7
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Keywords: Lutein-13C40, CS-O-11224, 282090-23-7, , 1C40H56O2, 608.58, Lutein is called a carotenoid vitamin. It is related to beta-carotene and vitamin A. Foods rich in lutein include broccoli, spinach, kale, corn, orange pepper, kiwi fruit, grapes, orange juice, zucchini, and squash. Lutein is absorbed best when it is taken with a high-fat meal.;Labeled Lutein, intended for use as an internal standard for the quantification of Lutein by GC- or LC-mass spectrometry.
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