Results 221 to 230 of about 19,377 (277)
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Phytochemistry, 1972
Abstract Samples of phytoene (7,8,11,12,7′,8′,11′,12′-octahydro-ψ,ψ-carotene) isolated from higher plant sources, from Neurospora crassa and strains of Phycomyces blakesleeanus and from diphenylamine-inhibited cultures of Rhodospirillum rubrum have been examined by a number of physical methods. All the organisms accumulate predominantly 15- cis
Aung Than +3 more
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Abstract Samples of phytoene (7,8,11,12,7′,8′,11′,12′-octahydro-ψ,ψ-carotene) isolated from higher plant sources, from Neurospora crassa and strains of Phycomyces blakesleeanus and from diphenylamine-inhibited cultures of Rhodospirillum rubrum have been examined by a number of physical methods. All the organisms accumulate predominantly 15- cis
Aung Than +3 more
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Phytoene production in Phycomyces
Archives of Biochemistry and Biophysics, 1957Summary The effects of streptomycin and methylheptenone on phytoene production in Phycomyces blakesleeanus have been studied. It is shown that methylheptenone acts as a powerful stimulant of phytoene production. The magnitude of the accumulation is comparable with that of β -caro-tene by β -ionone.
T, NAKAYAMA +3 more
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Archives of Biochemistry and Biophysics, 1956
Abstract Phytoene, a noncrystalline, colorless polyene isolated from tomatoes and carrot oil has been shown to have an acyclic isoprenic structure, and its perhydro derivative (perhydrophytoene) has been shown to be identical with perhydrolycopene. According to its physical and chemical properties and to the isolation of acetone, levulinic aldehyde ...
W J, RABOURN, F W, QUACKENBUSH
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Abstract Phytoene, a noncrystalline, colorless polyene isolated from tomatoes and carrot oil has been shown to have an acyclic isoprenic structure, and its perhydro derivative (perhydrophytoene) has been shown to be identical with perhydrolycopene. According to its physical and chemical properties and to the isolation of acetone, levulinic aldehyde ...
W J, RABOURN, F W, QUACKENBUSH
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Food Chemistry, 2019 The mechanisms of main tomato carotenes (phytoene, phytofluene, lycopene and β-carotene) intestinal absorption are still only partly understood. We thus compared carotene bioavailability in mice after gavage with carotene-rich oil-in-water emulsions.
Paula Mapelli-Brahm +2 more
exaly +2 more sources
Archives of Biochemistry and Biophysics, 1965
Abstract The configuration of natural phytoene is established as 15,15′ cis -7,8,7′,8′,11,12, 11′,12′-octahydrolycopene through ultraviolet, infrared, and nuclear magnetic resonance spectral analyses and through catalytic isomerization with iodine.
F B, JUNGALWALA, J W, PORTER
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Abstract The configuration of natural phytoene is established as 15,15′ cis -7,8,7′,8′,11,12, 11′,12′-octahydrolycopene through ultraviolet, infrared, and nuclear magnetic resonance spectral analyses and through catalytic isomerization with iodine.
F B, JUNGALWALA, J W, PORTER
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Isolation and properties of phytoene
Archives of Biochemistry and Biophysics, 1954Abstract Phytoene, a new noncrystalline, colorless polyene, has been isolated from tomatoes and carrot oil by an improved adsorptive procedure. It was adsorbed less strongly than the known carotenes and polyenes on magnesia and alumina. It produced a very weak Carr-Price reaction, but it did give a characteristic color reaction with the Liebermann ...
W J, RABOURN +2 more
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Planta, 1982
Envelope membranes of spinach chloroplasts contain appreciable activities of the carotenogenic enzymes phytoene synthase (formation of phytoene by condensation of two molecules geranylgeranyl pyrophosphate) and phytoene dehydrogenase (formation of lycopene from phytoene), plus a phosphatase activity.
F, Lütke-Brinkhaus +3 more
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Envelope membranes of spinach chloroplasts contain appreciable activities of the carotenogenic enzymes phytoene synthase (formation of phytoene by condensation of two molecules geranylgeranyl pyrophosphate) and phytoene dehydrogenase (formation of lycopene from phytoene), plus a phosphatase activity.
F, Lütke-Brinkhaus +3 more
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Phytoene Accumulation in Sunflower Decreases the Transcript Levels of the Phytoene Synthase Gene
Plant Growth Regulation, 2006The non dormant-1 (nd-1) mutant of sunflower (Helianthus annuus L.) and fluridone-treated plants were used to investigate the effect of phytoene accumulation on the transcript levels of the phytoene synthase (Ha-PSY) gene. A deficiency at the gene coding for ζ-carotene desaturase (ZDS) characterises the nd-1 mutant, which displays an accumulation of ζ ...
L. Campisi +5 more
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Journal of Agricultural and Food Chemistry
Phytoene, a colorless carotenoid with unique ultraviolet (UV)-B absorption properties, offers potential for applications in functional food, cosmetics, and therapeutics. However, their low natural yield poses a challenge for large-scale production.
Kwanghyun Park +4 more
semanticscholar +1 more source
Phytoene, a colorless carotenoid with unique ultraviolet (UV)-B absorption properties, offers potential for applications in functional food, cosmetics, and therapeutics. However, their low natural yield poses a challenge for large-scale production.
Kwanghyun Park +4 more
semanticscholar +1 more source
Biochemistry, 2003
Phytoene synthase (PSase) catalyzes the condensation of two molecules of geranylgeranyl diphosphate (GGPP) to give prephytoene diphosphate (PPPP) and the subsequent rearrangement of the cyclopropylcarbinyl intermediate to phytoene. These reactions constitute the first pathway specific step in carotenoid biosynthesis.
Dirk, Iwata-Reuyl +3 more
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Phytoene synthase (PSase) catalyzes the condensation of two molecules of geranylgeranyl diphosphate (GGPP) to give prephytoene diphosphate (PPPP) and the subsequent rearrangement of the cyclopropylcarbinyl intermediate to phytoene. These reactions constitute the first pathway specific step in carotenoid biosynthesis.
Dirk, Iwata-Reuyl +3 more
openaire +2 more sources