5 Lipids Spring08 bb - Lipids Triglycerides Phospholipids...

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Unformatted text preview: Lipids Triglycerides Phospholipids Sterols Lipids Triglycerides 3 Fatty Acids and 1 Glycerol Storage form Most common form in foods Phospholipids 2 Fatty Acids, 1 Glycerol and 1 Phosphate Group Emulsifier Cell Membrane Sterols Multiple Rings Cholesterol Hormones Vitamin D Terminology Hydrophobic insoluble in water Water fearing Hydrophilic interacts with water Water loving Lipophobic insoluble in fats Fat fearing Lipophilic attracted to fat Fat loving Terminology Lipophilic Hydrophobic Hydrophilic Lipophobic Triglycerides Composed of 3 fatty acids + 1 glycerol Functions Essential nutrients Energy source in foods Energy reserves in animals Insulation and protection Carriers of fat-soluble compounds Sensory qualities Satiety Triglyceride Structure Triglyceride Structure G L Y C E R O L Fatty Acid Fatty Acid Fatty Acid Triglyceride Structure C C C Triglyceride Structure Triglyceride Structure Glycerol Three carbon molecule Each carbon can bind with a fatty acid Most fatty acids in the body are attached to a glycerol molecule Fatty Acids Acid End Methyl End Carbon Chain All have an acid end and a methyl end All have a carbon chain Degree of saturation varies Length of carbon chain varies Methyl Group and Acid Group Acid Group = COOH Methyl Group = CH 3 Saturation Extent to which carbon bonds are taken up by hydrogen Saturated maximum number of hydrogen atoms Monounsaturated 1 double bond missing 2 hydrogen atoms Polyunsaturated two or more double bonds missing 4, 6, 8 hydrogen atoms Saturated Fatty Acid C C C C | | | | | | | | H H H H H H H H Saturated Fatty Acid all carbons in fatty acid chain are saturated with hydrogen atoms and form single bonds with one another Pack tightly together Properties Generally solid at room temperature Exception- short chained fatty acids tend to be more liquid Stable to heat and air long shelf life Examples Animal fats and oils Butter, lard Coconut, palm oil Mono UN saturated Fatty Acid One place of unsaturation Double bond between 2 carbon atoms Monounsaturated Fatty Acids contains one C=C double bond in the carbon chain Loss of hydrogen atoms Do not pack tightly together Properties Liquid at room temperature, solid at refrigerated temperatures Example Oils olive, canola Animal fats Polyunsaturated Fatty Acids Two or more areas of unsaturation Double bonds between 2 carbons contains 2 or more double bonds in carbon chain do not pack tightly together Properties Liquid at room temperature Labile to heat and air Examples Vegetable oils, corn & sunflower Cold water fish Polyunsaturated Fatty Acids Fatty Acids Saturated, Monounsaturated & Polyunsaturated These are different representations of the same fatty acid Nomenclature of Fatty Acids...
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5 Lipids Spring08 bb - Lipids Triglycerides Phospholipids...

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