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Fill the worksheet fatty_acids_nutrition__health_collaborati.docx

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fill the worksheet fatty_acids_nutrition__health_collaborative_learning_exercis e_2013.docx Scenario Fatty Acids, Nutrition and Health Students please note : It is assumed that you have an understanding of organic molecules as presented in your text book. If not, you should read chapter 3 in your text book dealing with organic molecules. At a minimum, you need to look over the sections associated with lipids. At the end of the scenario, there are some links listed to web sites that you might find useful.
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Its time for your annual physical examination… Suppose that you were visiting your doctor for an annual physical examination. While you were in the waiting room, you picked up and began to read a pamphlet about dietary fats (lipids) and their impacts on health. In order to remember them later, you typed some of the important points into a file on your laptop. To refresh your memory, and for your convenience (and the rest of the class), these notes can be seen below. Notes on Lipids and Health True lipids ( triglycerides
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) · composed of a glycerol molecule covalently bound to three fatty acid side chains · hydrophobic molecules, meaning they are non-polar and don’t mix with water · a group of triglycerides is called a fat
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Saturated fats · solid at room temperature (think of fat on an uncooked steak) · hydrocarbon chains in fatty acids have no carbon-carbon double covalent bonds · maximum number of hydrogens are covalently bound to the carbons, thereby “saturating” them · Saturated Fatty Acidanimal fats such as lard and butter are usually high in saturated fatty acids Unsaturated fats · liquid (oils) at room temperature
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· hydrocarbon chains of the fatty acids have at least one ( monounsaturated ) or more ( polyunsaturated ) carbon-carbon double covalent bonds · double bonds cause bends in the molecules and also leave them “unsaturated” with hydrogens · unsaturated fats are found in plant oils such as olive or canola oil Monounsaturated Fatty Acid Dietary fatty acids
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· fatty acids are a necessary component of a complete diet · fatty acids are found in foods such as fatty meats, plant oils and dairy products · certain polyunsaturated fatty acids (called essential fatty acids ) cannot be synthesized by the human body and must come from the diet · one such essential fatty acid is linoleic acid which can be found in foods such as sunflower oil and almonds · both monounsaturated and polyunsaturated fatty acids can be found in plant oils Polyunsaturated Fatty Acid
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Trans fats · are triglycerides that contain trans fatty acids · Trans means “across” so… · a trans fatty acid is an unsaturated one in which the hydrogens attached to adjacent carbons in a carbon-carbon double covalent bond are on opposite sides of the molecule · produced by the process of adding hydrogens to unsaturated vegetable oils · hydrogenation decreases the number of carbon-carbon double covalent bonds in the molecules and creates what are known as “
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hydrogenated ” or “
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  • Fall '16
  • Christopher L. Litten, MA, Ph.D.

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