Tocopherols
Mostrando 25-36 de 65 artigos, teses e dissertações.
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25. Concentração de tocoferois e fitoesterois a partir do destilado desodorizado de oleos vegetais atraves do processo de destilação molecular / Tocopherols and phytoesterols concentration from vegetable oil deodorized distillater through molecular distillation process
Tocopherols and phytosterols are minority compounds present in vegetables oils. Tocopherols show vitaminic activities and antioxidant properties. Vitamin E is composed by four tocopherols (a, b, g and d) and four tocotrienols (a, b, g and d). The phytosterols have anticholesterolemic and anticarcinogenic properties. The main natural sources of tocopherols an
Publicado em: 2007
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26. Diet and serum micronutrientes: association with cervical neoplasia and cancer / Consumo alimentar e concentrações séricas de micronutrientes: associação com lesões neoplásicas e câncer cervical
Cervical cancer is the second most common cancer in women worldwide. Human papillomavirus (HPV) infection has been recognized to be a necessary cause for cervical cancer. Serum concentrations and dietary carotenoids and tocopherols have been associated with the risk for cervical dysplasia, but results from previous studies were not consistent. Subjects and m
Publicado em: 2007
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27. Vitamin E: characterization of the biological activity and relation with the nuclear receptor PPARy. / Vitamina E: caracterização da atividade biológica na resposta inflamatória induzida pelo LPS e sua relação com o receptor nuclear PPARy.
Vitamin E, a generic term to describe a group of structurally lipophilic molecules (tocopherols and tocotrienols), is one of the most known antioxidants and it has been studied also because its non-antioxidant roles. By the way, depending on the administered dose, -tocopherol can exert antagonic effects in vitro. Its known that PPAR, a nuclea
Publicado em: 2007
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28. Tocopherols and phytoesterols concentration from vegetable oil deodorized distillater through molecular distillation process / Concentração de tocoferois e fitoesterois a partir do destilado desodorizado de oleos vegetais atraves do processo de destilação molecular
Os tocoferóis e fitoesteróis são componentes minoritários presentes em plantas e óleos vegetais. Os tocoferóis apresentam atividades vitamínicas e propriedades antioxidantes. A vitamina E é composta por 4 tocoferóis (a, b, g e d) e 4 tocotrienóis (a, b, g e d). Os fitoesteróis possuem propriedades anticolesterolêmica e anticarcinogênicas. Uma da
Publicado em: 2007
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29. Antioxidantes utilizados em óleos, gorduras e alimentos gordurosos
Lipid oxidation is certainly one of the most important alterations that affect both oils or fats and foods that contain them. It is responsible for the development of unpleasant taste and smell in foods, making them unsuitable for consuming. The use of antioxidants permits a longer useful life of these products. This work presents a bibliographic review of r
Química Nova. Publicado em: 2006-07
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30. Supercritical fluid extraction (SFE) of rice bran oil to obtain fractions enriched with tocopherols and tocotrienols
Parboiled rice bran oil was obtained with supercritical CO2 at temperatures and pressures varying from 25 to 60ºC and from 150 to 250 bar, respectively. This study was divided into two different parts: initially, the experiments were carried out with one separation step. In the second part, experiments were performed with two separators in series. The tempe
Brazilian Journal of Chemical Engineering. Publicado em: 2006-06
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31. Studies and experiments for tocopherols and phytosterols concentration through molecular distillation / Estudos e experimentos para a concentração de tocoferois e fitoesterois por meio da destilação molecular
Neste trabalho, foram realizados ensaios para avaliar a concentração de tocoferóis e fitoesteróis a partir do destilado desodorizado de óleo de soja (DDOS) utilizando o processo de destilação molecular. Os destilados desodorizados de óleos vegetais (DDOV) são subprodutos gerados pelas indústrias de refino de óleos vegetais, e podem ser considerado
Publicado em: 2006
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32. Optimization of the process of concentration of vitamin e from DDSO using supercritical CO2
The objective of this work was the scientific development of concentration of vitamin E from deodorizer distillate of soybean oil (DDSO) using supercritical CO2. Vitamins and sterols rare produced synthetically, but recently the interest in their extraction from natural sources has increased. Therefore, the motivation behind this work was to concentrate the
Brazilian Journal of Chemical Engineering. Publicado em: 2005-03
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33. Implantação das metodologias de caracterização e estudo da remoção de acidos graxos livres dos destilados desodorizados de oleos vegetais por meio da destilação molecular
Distilates of the vegetable oil deodorization (DVOD) are composed by free fatty acids, phytosterols, tocopherols, phytosterol esters, hydrocarbons, acylglycerols and products of decomposition of these molecules. The content of free fatty acids (FFA) in the deodorizer distillates varies between 24% and 85%. Due to its high content, free fatty acid separation
Publicado em: 2005
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34. Vitaminas lipossolúveis em alimentos: uma abordagem analítica
This study concerns certain problems inherent to the determination of fat-soluble vitamins in food, from extraction methods to identification and quantification. The discussion involves the main official and unofficial extraction methods coupled with spectrophotometric and HPLC techniques in which vitamins samples are obtained through liquid-liquid-solid and
Química Nova. Publicado em: 2004-02
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35. Estudos dos processos de destilação molecular para a obtenção de alfa-tocoferol (vitamina E) e de extração supercritica para a obtenção de alfa-tocoferol e beta-carotero (pro-vitamina A)
Brazil has a privileged position due to its potentiality of natural resources and agriculture, mainly, in this moment that the substitution of conventional materials used in the nutritious, pharmaceutical and cosmetic areas by natural products has gained interest and importance. However, technologies to take advantage of such resources are not fully explored
Publicado em: 2004
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36. Desacidification of the oil of bran of rice for extration liquid-liquid. / Desacidificação do oleo de farelo de arroz por extração liquido-liquido.
The objective of this work was to evaluate the rice bran oil deacidification process by liquid-liquid extraction (LLE), in a continuous equipment, using aqueous ethanol as solvent. The alternative process was evaluated in terms of: ability to extract the free fatty acids; ability to minimize the neutral oil loss and, ability to preserve nutraceutical compoun
Publicado em: 2004