BIOSINTESIS DE ACIDOS GRASOS PDF

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Rev Chil Nutr Vol. Universidad de Chile, Santiago de Chile. The evidence ofa direct link between saturatedfat consumption and an increased risk of cardiovascular diseases has led consumers to consider oils derived from vegetables, and industrial products derived from them, as healthier substitutes than animal fats.

Dietary TFA consumption has a biological and industrial origin; the latterfound in margarine, shortening, home and industrial cooking oil, bakery goods, and the wide range of'snack foods. Substantial TFA amounts comefrom the so called "invisible fats", the raw material used to manufacture more complexfoods.

The current wisdom is that TFA have an adverse effect on cardiovascular health, and its consumption poses a potential risk for increasing the incidence ofheart disease. Key words : Trans fatty acids, health effects, lipoprotein metabolism.

Las grasas utilizadas para la manufactura industrial de alimentos grasa "invisible" contienen elevadas cantidades de AGT. En resumen, los tejidos humanos absorben e incorporan AGT de la dieta a niveles que reflejan su ingesta. AGT y sus efectos sobre el metabolismo lipoproteico y del colesterol. El efecto de los AGT en el metabolismo lipoproteico ha sido estudiado, principalmente, utilizando aceites vegetales parcialmente hidrogenados.

Es interesante destacar que en estudios realizados por Morgado et al. Tampoco hay evidencias de mayor riesgo de cancer de colon y recto derivada del consumo de AGT Sin embargo, un tercer estudio correlaciona positivamente a los AGT con una mayor incidencia de diabetes De cualquier forma, todos los antecedentes indican a que el consumo de AGT es nocivo para la salud humana, por lo cual deben realizarse todos los esfuerzos posibles para reducir su consumo.

Grundy SM. What is the desirable ratio of saturated, polyunsaturated, and monounsaturated fatty acids in the diet? Dietary fat intake and the risk of coronary heart disease in women. N Engl J Med ; Beyond saturated fats: The importance of the dietary fatty acid profile on cardiovascular disease.

Nutr Rev ; Dietary fats and oils: Technologies for improving cardiovascular health. Curr Atheroscler Rep ; 6: Sommerfield M. Trans unsaturated fatty acids in natural products and processed foods. Prog Lipid Res ; Types of dietary fat and risk of coronary heart disease. J Am Col Nutr ; Dutton HJ.

Hydrogenation of fats and its significant. Geometrical and positional trans fatty acids isomers. Champaign, IL. American Oil Chemist Society ; Structure, function, and dietary regulation of delta 6, delta 5, and delta 9 desaturases. Annu Rev Nutr ; J Assoc Anal Chem ; Ulberth F, Henninger M. J Am Oil Chem Soc ; Ratnayake WM. Analysis of trans fatty acids. Trans fatty acids in human nutrition.

Dundee, Scotland. The Oily Press ; Effect of the degree of hydrogenation of dietary fish oil on the trans fatty acid content and enzymatic activity of rat hepatic microsomes.

Lipids ; Simopoulos A. Overview of evolutionary aspects of omega-3 fatty acids in the diet. World Rev Nutr Diet ; Valenzuela A, Morgado N. Fats and oils in the human nutrition: about the history. Rev Chil Nutr ; The biologically-active isomers of conjugated linoleic acid.

Prog Lipid Res ; Conjugated linoleic acid and obesity control: efficacy and mechanisms. Isomeric monoenoic fatty acids in bovine milk fat. Biochim Biophys Acta ; Occurrence and distribution profiles of trans acids in edible fats of natural origin. Trans Fatty Acids in Human Nutrition.

Mounts TL. En: Pryde EH, editor. Fatty Acids. American Oil Chemists Society ; Alien RR. Hydrogenation: En, Swern D, ed. John Wiley and Sons ; Chrysam MM. Table spreads and shortenings. En: Applewhite TH, ed. Bailey's Industrial Oil and Fat products. New York, John Wiley and Sons ; Patterson HB.

Hydrogenation of fats and oils: Theory and practice. Analysis for geometrical and positional isomers of fatty acids in partially hydrogenated fats. J Am Oil Chem Soc ; Biol Res ; Linolenic acid artifacts from deodorization of oils. Deneke R About formation of trans fatty acids during deodorization of rapeseed oil. It is possible to improve the nutritional quality of edible oils? Blomstrand R, Svensson L.

The effects of partially hydrogenated marine oils on the mitochondrial function and membrane phospholipid fatty acids in ratheart. Influence of dietary partially hydrogenated vegetable and marine oils on membrane composition and function of liver microsomes and platelets in the rat. Metabolic effects of trans fatty acids on an experimental dietary model. Br J Nutr ; Selective effects of isomeric cis and trans fatty acids on fatty acyl delta 9 and delta 6 desaturation by human skin fibroblasts.

Biochim Biophys Acta ; , Effect of dietary fats on desaturase activities and the biosynthesis of fatty acids in rat liver microsomes. Occurrence of octadecenoic fatty acid isomers from hydrogenated fats in human tissue lipid classes. Emken EA. Nutrition and biochemistry of trans and positional fatty acid isomers in hydrogenated oils. Ann Rev Nutr ; 4: Positional specificity of trans fatty acids in fetal lecithin.

Lipids ; Occurrence of 5c,8c,11c,15t-eicosatetraenoic acid and other unusual polyunsaturated fatty acids in rats fed partially hydrogenated canola oil. Sugano M, Ikeda I. Metabolic interactions between essential and trans fatty acids. Curr Opin Lipidol ; 7: Petersen J, Opstvedt J. Fatty acid composition of the brain and other organs in the newborn piglet. Koletzko B.

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Biosintesis

Rev Chil Nutr Vol. Universidad de Chile, Santiago de Chile. The evidence ofa direct link between saturatedfat consumption and an increased risk of cardiovascular diseases has led consumers to consider oils derived from vegetables, and industrial products derived from them, as healthier substitutes than animal fats. Dietary TFA consumption has a biological and industrial origin; the latterfound in margarine, shortening, home and industrial cooking oil, bakery goods, and the wide range of'snack foods. Substantial TFA amounts comefrom the so called "invisible fats", the raw material used to manufacture more complexfoods. The current wisdom is that TFA have an adverse effect on cardiovascular health, and its consumption poses a potential risk for increasing the incidence ofheart disease. Key words : Trans fatty acids, health effects, lipoprotein metabolism.

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Biosintesis de Acidos Grasos

De esta transferencia se forma GlcNAc-P. Una vez llega a la membrana, se une a esta quedando el GPI en la cara extracelular. Un ejemplo de control primario se encuentra en las diferencias en las cadenas laterales de glicanos en las GPI en la enzima membrana dipeptidasa entre humanos y bovinos. Y un ejemplo de control secundario es la diferencia entre las cadenas laterales de glicano de VSG V ariant S urface G licoprotein cuando algunas de estas enzimas con diferentes secuencias carboxi-terminales se expresan en el mismo trypanosoma. El GPI no es de gran importancia en la primera, pero en su segunda forma hace uso de receptores de transferrina que se encuentran anclados a GPI.

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Composition, physiology and biosynthesis of plant cuticle. Julio C. Postal Recibido: 11 de Mayo del Aceptado: 21 de Noviembre del The cuticle is a protective layer located in the outermost surface of all aerial tissues of higher plants and therefore, interacts with the environment. The cuticle is composed mainly of two types of lipophilic polymers, namely: cutin and cuticular waxes, which composition and ultrastructure can be altered by genetic, physiological and environmental factors, both during growth and development as well as during postharvest; its morphology and chemical composition cannot be generalized. The cuticle plays an important role acting as a barrier reducing water loss and gas diffusion, restraining water and dust accumulation, participating in the plant-insect interaction, as a component of the signal transduction leading to the activation of specific genes, controlling temperature fluctuations and providing mechanical support.

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