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February 15 2012 lipids

February 15 2012 lipids - LIPIDS LEI 12 SP Functions of...

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LIPIDS LEI 12 SP
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Functions of Lipids Nature’s way of condensing energy stores - also insulates/protects organs Source of calories ( 9 calories/gram ) Flavor and tenderness of food Slow stomach emptying - more satiating Source of essential fatty acids
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Types of Lipids Triglycerides Phospholipids Sterols
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Phospholipids Glycerol + two fatty acids + phosphorus Phosphorus part makes it soluble in water Fatty acids make it soluble in fat Therefore can serve as an emulsifier Key role is in cell membranes
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Sterols Large molecules consisting of interconnected rings of carbon atoms with side chains of carbon, hydrogen, and oxygen attached Cholesterol is found in all animal cell membranes is nonessential forms plaques that cause atherosclerosis Cholesterol serves as the raw material for bile vitamin D steroid hormones including the sex hormones
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Triglycerides Main form of fat in food Made up of glycerol backbone and three fatty acids Fatty acids classified by length (#) of carbon atoms, and location of double bonds, organization of hydrogen around the double bonds
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Saturated Fatty Acid A fatty acid carrying the maximum # of hydrogen atoms
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Unsaturated Fatty Acid A fatty acid with less than maximum hydrogen atoms monounsaturated FA polyunsaturated FA
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Saturated Monounsaturated Polyunsaturated Saturated & Unsaturated Fats Omega-9
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Trans Fatty Acids Fatty Acids with unusual shapes Arise when polyunsaturated oils are hydrogenated
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