5 Lipids Spring08 bb

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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This note was uploaded on 10/28/2009 for the course NTR 56555 taught by Professor Meadows during the Spring '09 term at University of Texas.

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5 Lipids Spring08 bb - Lipids Triglycerides Phospholipids...

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