Results 221 to 230 of about 16,041 (278)
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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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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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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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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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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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Chemical Physics, 2010
The problem of photoprotection associated with the xanthophyll cycle is addressed by examination of effects of exogenous violaxanthin and zeaxanthin on isolated antenna complex LHCII. Analysis of electronic absorption spectra suggests multiple sites of binding of violaxanthin and zeaxanthin to the protein environment.
Wiesław Ignacy Gruszecki +9 more
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The problem of photoprotection associated with the xanthophyll cycle is addressed by examination of effects of exogenous violaxanthin and zeaxanthin on isolated antenna complex LHCII. Analysis of electronic absorption spectra suggests multiple sites of binding of violaxanthin and zeaxanthin to the protein environment.
Wiesław Ignacy Gruszecki +9 more
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Xanthophylls from blood to retina
Acta Ophthalmologica, 2010AbstractXanthophylls are dietary lipophilic compounds. Among them, lutein and zeaxanthin are the major carotenoids found in the human lens and retina, and referred as macular pigment within the retina. Lutein and zeaxanthin cannot be synthesized endogenously. They may therefore be considered as essential and must be provided by adequate dietary intakes.
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Xanthophyll Pigmentation in Sheep Fat
Nature, 1962CASTLE1 concluded from the observations of Zophoniasson that the yellow fat appearing in some Icelandic sheep is due to a simple recessive character in inheritance. I have recently examined the chemical nature of the yellow pigments in the adipose tissue of some Irish sheep.
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