Results 191 to 200 of about 9,567 (236)

Analysis of Xanthophylls in Corn by HPLC

Journal of Agricultural and Food Chemistry, 2002
An 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, D, Darnoko, M, Cheryan, E G, Perkins, J, Jerrell   +4 more
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The Chemistry of Novel Xanthophyll Carotenoids

The American Journal of Cardiology, 2008
Natural 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, Cristi L, Braun, Hansgeorg, Ernst   +2 more
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The Xanthophylls of Tomatoes

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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Xanthophyll Esters in Human Skin

Archives of Biochemistry and Biophysics, 1998
Carotenol 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, 1990
Oriented 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, Sielewiesiuk, J.   +1 more
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Xanthophylls from blood to retina

Acta Ophthalmologica, 2010
AbstractXanthophylls 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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XANTHOPHYLLS AND THE HILL REACTION*

Photochemistry and Photobiology, 1962
SummaryThe incorporation of oxygen from water enriched in H218O into the leaf xanthophylls during the Hill reaction was investigated. No enrichment was detectable in violaxanthin and neoxanthin. A low incorporation into lutein, which was not dependent on the Hill reaction, was observed.The results indicate that the epoxy pigments do not function as an ...
H. Y. Yamamoto, C. O. Chichester, T. O. M. Nakayama   +2 more
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Deaggregation of Chlorophyll a by Xanthophylls

Nature, 1967
IT is known1–3 that the chlorophylls (but not their pheophytins) will aggregate in a variety of non-polar solvents (for example, benzene and carbon tetrachloride), with characteristic spectra for the respective monomers and dimers. These aggregates are concentration-dependent in the usual mass action sense up to a concentration of at least 10−2 moles/l.
S. ARONOFF, PATRICIA KIRK
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Xanthophyll Pigmentation in Sheep Fat

Nature, 1962
CASTLE1 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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Protective role of xanthophylls

Acta Ophthalmologica, 2010
AbstractXanthophylls, also known as carotenoids are a group of natural fat‐soluble pigments that are especially abundant in green and yellow‐orange fruits and vegetables. Based on epidemiologic data, it is now evident that carotenoids provide health benefits and particularly in eye diseases.
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