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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-esterification) of lutein esters to yield free lutein may yield lutein in any ratio from 1:1 to 1:2 molar ratio with the saponifying fatty acid.
- C₄₀H₅₆O₂
- 568.871 g/mol
- 190 °C (374 °F; 463 K)
- Insoluble
Meso-zeaxanthin, lutein, and 3R,3′R-zeaxanthin are the main carotenoids in the macula lutea, found in a ratio of 1:1:1, and are collectively referred to as macular pigment (MP). Meso-zeaxanthin is concentrated at the epicentre of the macula, where it accounts
- orange-red
- 568.87144 g/mol
- C₄₀H₅₆O₂
- insol
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Luteinizing hormone ( LH, also known as luteinising hormone, [1] lutropin and sometimes lutrophin [2]) is a hormone produced by gonadotropic cells in the anterior pituitary gland. The production of LH is regulated by gonadotropin-releasing hormone (GnRH) from the hypothalamus. [3] .
Three subsequent meta-analyses of dietary lutein and zeaxanthin concluded that these carotenoids lower the risk of progression from early stage AMD to late stage AMD. [15] [16] [17] A 2023 (updated) Cochrane review of 26 studies from several countries, however, concluded that dietary supplements containing zeaxanthin and lutein have little to no influence on the progression of AMD. [18]
- C₄₀H₅₆O₂
- 568.88 g/mol
- 215.5 °C (419.9 °F; 488.6 K)
- insol.
The corpus luteum ( Latin for "yellow body"; pl.: corpora lutea) is a temporary endocrine structure in female ovaries involved in the production of relatively high levels of progesterone, and moderate levels of estradiol, and inhibin A. [1] [2] It is the remains of the ovarian follicle that has released a mature ovum during a previous ovulation.
- Corpus luteum
- D003338
Xanthophyll. The characteristic color of egg yolk results from the presence of a xanthophyll pigment typical in color of lutein or zeaxanthin of the xanthophylls, a division of the carotenoids group. Xanthophylls (originally phylloxanthins) are yellow pigments that occur widely in nature and form one of two major divisions of the carotenoid ...
European Food Safety Authority (EFSA) published a scientific opinion on a similar xanthophyll carotenoid, lutein, stating that "following passage through the gastrointestinal tract and/or uptake lutein esters are hydrolyzed to form free lutein again".
