Results 301 to 310 of about 197,296 (333)
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Carotenoids with two chromophores: carotenoid retinoates
Natural Product Research, 2011In this study, carotenoid retinoates are described for the first time. The preparation was achieved by the azolide method. Various sec carotenols reacted with N-retinoylimidazol in the presence of catalytic amounts of sodium hydride. Mono- and diretinoates of (3R,3'R)-zeaxanthin and its (3S,3'S)-enantiomer, (9Z,9'Z; 3R,3'R)-alloxanthin, (3R,3'R)-7,8,7',
Bjart Frode Lutnaes +2 more
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SYNTHESIS OF CAROTENOID GLYCOSYLESTERS AND OTHER CAROTENOIDS [PDF]
Pure and Applied Chemistry, 1979 Abstract: The naturally occurring crocetin di(β-D-glucosyl)ester can be synthesised from crocetin diimidazolide or crocetin di-(1,2,4-triazolide) and β-D-glucose in pyridine in presence of a base. The application of this new method to other carboxylic acids (8′ -apo-β-carotene-8′-oic acid, vitamin A acid, benzoic acid and stearic acid) and ...
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Photochemistry and Photobiology, 1996
Carotenoids are usually considered to perform two major functions in photosynthesis. They serve as accessory light harvesting pigments, extending the range of wavelengths over which light can drive photosynthesis, and they act to protect the chlorophyllous pigments from the harmful photodestructive reaction which occurs in the presence of oxygen ...
Harry A. Frank, Richard J. Cogdell
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Carotenoids are usually considered to perform two major functions in photosynthesis. They serve as accessory light harvesting pigments, extending the range of wavelengths over which light can drive photosynthesis, and they act to protect the chlorophyllous pigments from the harmful photodestructive reaction which occurs in the presence of oxygen ...
Harry A. Frank, Richard J. Cogdell
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Nutrition Reviews, 2009
Interactions between carotenoids during absorption and during postabsorptive metabolism have been demonstrated or suggested in animal and human feeding or supplementation studies, as well as in in vitro studies of intestinal beta-carotene cleavage.
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Interactions between carotenoids during absorption and during postabsorptive metabolism have been demonstrated or suggested in animal and human feeding or supplementation studies, as well as in in vitro studies of intestinal beta-carotene cleavage.
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Carotenoids of the centrarchidae
Comparative Biochemistry and Physiology, 1970Abstract 1. 1. The carotenoid found in the skin and fins of eleven species of Centrarchids was identified as lutein, in the esterified form. 2. 2. Of the five genera, Lepomis generally has higher concentrations of pigment. 3. 3. Astaxanthin appears in the fins and skin of Lepomis megalotis during the breeding season.
G. Crozier +3 more
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Archives of Biochemistry and Biophysics, 2004
The possible involvement of several transcription systems in the anticancer activity of carotenoids is the focus of this review. Carotenoids modulate the basic mechanisms of cell proliferation, growth factor signaling, gap junctional intercellular communication, and produce changes in the expression of many proteins participating in these processes ...
Yoav Sharoni +4 more
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The possible involvement of several transcription systems in the anticancer activity of carotenoids is the focus of this review. Carotenoids modulate the basic mechanisms of cell proliferation, growth factor signaling, gap junctional intercellular communication, and produce changes in the expression of many proteins participating in these processes ...
Yoav Sharoni +4 more
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ChemInform Abstract: Carotenoids and Polyterpenoids
ChemInform, 1978AbstractReview: (705 refs.
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Carotenoids and Photosynthesis
2016Carotenoids are ubiquitous and essential pigments in photosynthesis. They absorb in the blue-green region of the solar spectrum and transfer the absorbed energy to (bacterio-)chlorophylls, and so expand the wavelength range of light that is able to drive photosynthesis.
Hideki Hashimoto +2 more
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Photoprotection by carotenoids
Journal of Ethnopharmacology, 1988Carotenoid pigments have been found to have a protective function against photosensitization in green plants. This protective ability has been exploited in the administration of high doses of beta-carotene to patients with erythropoietic protoporphyria to ameliorate the photosensitivity associated with this disease.
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