Zeaxanthin
Mostrando 1-12 de 108 artigos, teses e dissertações.
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1. Improvement of the Extraction Process for High Commercial Value Pigments from Desmodesmus sp. Microalgae
Considering the high interest and commercial value of pigments from microalgae, this study aimed to stablish the best lutein and β-carotene extraction method for Desmodesmus sp., a microalgae with high biomass production. The evaluation was done considering the best solvent or solvent mixture, number of extractions, pre-treatment of dry biomass with acetone
J. Braz. Chem. Soc.. Publicado em: 2016-06
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2. The Effects of Different Types of Antioxidants (Se, Vitamin E and Carotenoids) in Broiler Diets on the Growth Performance, Skin Pigmentation and Liver and Plasma Antioxidant Concentrations
Abstract This study investigated the effects of the addition of different antioxidants to broiler diets on their live performance, liver antioxidant composition and concentrations, immune response, and meat and skin color. A total of 945 three-day-old Ross 308 broiler chicks of both genders were randomly allocated to one of nine dietary treatments (n=105), w
Rev. Bras. Cienc. Avic.. Publicado em: 2016-03
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3. Influence of the moisture at harvest and drying process of the grains on the level of carotenoids in maize (Zea mays)
AbstractMaize is considered a source of carotenoids; however, these compounds are highly unstable, degraded by high temperatures, exposure to light and presence of oxygen. The objective of this work was to evaluate the influence of the moisture and type of drying applied to grains on the level of carotenoids in yellow maize. The experiment was conducted in a
Food Sci. Technol. Publicado em: 15/09/2015
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4. Main food sources of carotenoids, according to the purpose and degree of processing, for beneficiaries of the 'Bolsa Família' in Brazil
The intake of carotenoids is associated with antioxidant properties and some of these substances have activity of pro-vitamin A. This study aimed to estimate the intake of carotenoids (average values) by the Brazilian population focusing on beneficiaries of the 'Bolsa Família' Program and identify the dietary sources, according to the purpose and degree of
Food Sci. Technol. Publicado em: 2014-06
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5. Analysis of photosynthetic pigments and phenolic compounds in Gracilariopsis tenuifrons (C.J. Bird &E.C. Oliveira) Fredericq &Hommersand at different light intensities / Análise de pigmentos fotossintetizantes e substâncias fenólicas em Gracilariopsis tenuifrons (C. J. Bird &E. C. Oliveira) Fredericq &Hommersand em diferentes intensidades de luz
The high-light stress can adversely affect growth and development of photosyn-thetic organisms. In these situations, it is common to note chemical responses that may indicate different strategies of photoprotection. In this study, protocols were optimized for analysis and extraction of phenolic compounds and photosynthetic pig-ments in macrophytic red algae
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/08/2012
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6. Antioxidant activity and chemical composition of the non polar fraction of Gracilaria domingensis (Kützing) Sonder ex Dickie and Gracilaria birdiae (Plastino & Oliveira)
Gracilaria domingensis (Kützing) Sonder ex Dickie and Gracilaria birdiae (Plastino & Oliveira) (Gracilariales, Rhodophyta) are seaweeds that occur on the Brazilian coast. Based on their economic and pharmaceutical importance, we investigated the antioxidant activity of the methanolic, ethyl acetate and hexane extracts of both species. The hexane extracts di
Revista Brasileira de Farmacognosia. Publicado em: 15/05/2012
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7. Stability of the pigmentation of egg yolks enriched with omega-3 and carophyll stored at room temperature and under refrigeration
The objective of this experiment was to study yolk pigmentation stability in omega 3 (ω-3) enriched eggs stored under different temperatures in zeaxanthin equivalent (by using visible light spectrophotometer) and visual score (with values obtained by yolk color fan) and to verify the correlation among those methodologies. Three hundred big eggs from Isa Bro
Revista Brasileira de Zootecnia. Publicado em: 2011-07
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8. Effects of heavy metals and light levels on the biosynthesis of carotenoids and fatty acids in the macroalgae Gracilaria tenuistipitata (var. liui Zhang & Xia)
We present here the effect of heavy metals and of different light intensities on the biosynthesis of fatty acids and pigments in the macroalga Gracilaria tenuistipitata (var. liui Zhang & Xia). In order to verify the fatty acid content, gas chromatography with flame ionization detection (GC-FID) was employed. Pigments (major carotenoids and chlorophyl-a) wer
Revista Brasileira de Farmacognosia. Publicado em: 15/04/2011
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9. Variation in protein and pigment content in colour strains of Gracilaria domingensis in the natural populations of Rio do Fogo (RN) / Variação no conteúdo protéico e pigmentar em variantes cromáticas de Gracilaria domingensis nas populações naturais de Rio do Fogo-RN, BRASIL
The seaweed Gracilaria domingensis is a common species in the coast of Rio Grande do Norte. This species lives in the intertidal zone, where colour strains (red, green and brown) co-occur during the whole year. Seaweeds that live in this region are exposed to daily changes and to the rhythm of the tide. During the low tide they are exposed to dissection, hip
Publicado em: 2009
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10. Caracterização e diversidade genética de acessos de maracujás do cerrado com base no perfil de carotenóides / Characterization and genetic diversiy of cerrado passion fruit accessions based on carotenoids profile
The composition of carotenoids in fruits is complex and variable. Therefore, extraction methods and different analytical procedures must be applied to a correct determination of carotenoids. Fruits and vegetables are their main sources in human diet. Carotenoids are responsible by pulp color of passion fruit and many fruits, flowers and leaves. In Cerrado ar
Publicado em: 2009
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11. Crescimento, fotossíntese e mecanismos de fotoproteção em mudas de café (Coffea arabica L.) formadas a pleno sol e à sombra / Growth, photosynthesis and mechanisms of photoprotection in coffee (Coffea arabica L.) seedlings grown under full sunlight and shade
Coffee seedlings have been traditionally grown in shaded nurseries. However, some coffee growers, with the aim of improving acclimation after moving the seedlings from the nursery to the field, are growing the seedlings under full sun. Nonetheless, most information associated with cultivation of coffee seedlings under varying light is restricted to simple mo
Publicado em: 2008
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12. Anatomical and physiological plasticity of leaves of Coffea arabica L. in response to irradiance / Plasticidade anatômica e fisiológica de folhas de Coffea arabica L. em resposta à irradiância
Morphological, physiological and biochemical parameters were examined in coffee leaves from different canopy positions. Four classes of leaves were chosen based on the mean diurnal intercepted photosynthetically active radiation. These classes (treatments) comprised leaves intercepting 30, 75, 300, 750 μmol photons m-2 s-1, hereafter referred to T1, T2,
Publicado em: 2008