Results 181 to 190 of about 7,776 (232)
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Survey of Ophthalmology, 2005
The macular pigments are predominantly composed of three carotenoids: lutein, zeaxanthin, and meso-zeaxanthin. These carotenoids are concentrated and distributed in a selective manner. The properties of these pigments are further explored along with their methods of uptake, stabilization, and storage.
Shazia S, Ahmed +2 more
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The macular pigments are predominantly composed of three carotenoids: lutein, zeaxanthin, and meso-zeaxanthin. These carotenoids are concentrated and distributed in a selective manner. The properties of these pigments are further explored along with their methods of uptake, stabilization, and storage.
Shazia S, Ahmed +2 more
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A role for β,β-xanthophylls in Arabidopsis UV-B photoprotection [PDF]
Journal of Experimental Botany, 2018 Plastidial isoprenoids, such as carotenoids and tocopherols, are important anti-oxidant metabolites synthesized in plastids from precursors generated by the methylerythritol 4-phosphate (MEP) pathway.
Maria Lorena Falcone Ferreyra +2 more
exaly +3 more sources
Cation radicals of xanthophylls
Photosynthesis Research, 2007Carotenes and xanthophylls are well known to act as electron donors in redox processes. This ability is thought to be associated with the inhibition of oxidative reactions in reaction centers and light-harvesting pigment-protein complexes of photosystem II (PSII).
Mary Grace I, Galinato +4 more
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1993
Among all the carotenoids which are present in the photosynthetic membranes of higher plants, only three undergo rapid, light-induced changes in their concentration. These are the three xanthophylls of the xanthophyll cycle and they undergo intercon versions induced by changes in light intensity. Furthermore, the acclimation of photosynthetic organs to
B. Demmig-Adams, W. W. Adams
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Among all the carotenoids which are present in the photosynthetic membranes of higher plants, only three undergo rapid, light-induced changes in their concentration. These are the three xanthophylls of the xanthophyll cycle and they undergo intercon versions induced by changes in light intensity. Furthermore, the acclimation of photosynthetic organs to
B. Demmig-Adams, W. W. Adams
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Transactions of the Kansas Academy of Science (1903-), 1954
No intensive study has been reported on the isolation and identification of the xanthophylls of freshly cut alfalfa. Zscheile et al. (7) mentioned briefly that they obtained lutein by chromatography of alfalfa leaves, and Strain (6) observed that egg yolks of chickens kept on a ration of wheat bran, milk, and fresh alfalfa contained minute traces of ...
L. A. Gugliemelli +2 more
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No intensive study has been reported on the isolation and identification of the xanthophylls of freshly cut alfalfa. Zscheile et al. (7) mentioned briefly that they obtained lutein by chromatography of alfalfa leaves, and Strain (6) observed that egg yolks of chickens kept on a ration of wheat bran, milk, and fresh alfalfa contained minute traces of ...
L. A. Gugliemelli +2 more
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Analysis of Xanthophylls in Corn by HPLC
Journal of Agricultural and Food Chemistry, 2002An HPLC method was developed using the C-30 carotenoid column to separate and identify the major xanthophylls in corn (lutein, zeaxanthin, and beta-cryptoxanthin). A photodiode array detector and a mobile phase consisting of methyl tert-butyl ether/methanol/water was used. All three xanthophylls eluted in less than 25 min.
E E, Moros +4 more
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The Chemistry of Novel Xanthophyll Carotenoids
The American Journal of Cardiology, 2008Natural product isolates are typically not developed as drug candidates because of the difficulty in obtaining the desired stable molecular orientation (ie, stereochemistry), purity, and scale required to meet pharmaceutical industry standards. Recent advances in medicinal and process chemistry have played key roles in transforming a class of dietary ...
Henry, Jackson +2 more
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Journal of Food Science, 1961
SUMMARY The carotenoids of ripe tomatoes were found to contain about 6% xanthophylls; the composition of the latter was about 15% monols, 49% diols, 4% monoepoxide diols, 22% diepoxide diols, and 11% polyols. The diol and polyol xanthophylls were much like those of green leaves, with lutein the major pigment, somewhat smaller amounts ...
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SUMMARY The carotenoids of ripe tomatoes were found to contain about 6% xanthophylls; the composition of the latter was about 15% monols, 49% diols, 4% monoepoxide diols, 22% diepoxide diols, and 11% polyols. The diol and polyol xanthophylls were much like those of green leaves, with lutein the major pigment, somewhat smaller amounts ...
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Xanthophyll Esters in Human Skin
Archives of Biochemistry and Biophysics, 1998Carotenol fatty acid esters in various fruits and vegetables are sources of carotenoids for humans and are cleaved during intestinal absorption to yield the parent xanthophyll. In the present study we demonstrate that low amounts of carotenol esters are present in human skin.
T, Wingerath, H, Sies, W, Stahl
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Orientation of xanthophylls in phosphatidylcholine multibilayers
Biochimica et Biophysica Acta (BBA) - Biomembranes, 1990Oriented multibilayers of dimyristoyl phosphatidylcholine (DMPC) modified with violaxanthin or zeaxanthin were examined by X-ray diffractometry and linear dichroism. It appears that pigment molecules and the normal to the bilayer plane form an angle of 24-25 degrees.
Wiesław Ignacy Gruszecki +1 more
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