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Lipids

Lipids. Pages 40 to 41. Lipids. Chemical composition Carbon, hydrogen, oxygen and sometimes phosphorus Building Blocks Glycerol with 1 to 3 fatty acids Phospholipids have glycerol, 2 fatty acids and a phosphate Structure Long chains (triglycerides and phospholipids)

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Lipids

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  1. Lipids Pages 40 to 41

  2. Lipids • Chemical composition • Carbon, hydrogen, oxygen and sometimes phosphorus • Building Blocks • Glycerol with 1 to 3 fatty acids • Phospholipids have glycerol, 2 fatty acids and a phosphate • Structure • Long chains (triglycerides and phospholipids) • Ring structure (steroids)

  3. Fig. 5-11 Fatty acid (palmitic acid) Glycerol (a) Dehydration reaction in the synthesis of a fat Ester linkage (b) Fat molecule (triacylglycerol)

  4. Fig. 5-13 Choline Phosphate Hydrophilic head Glycerol Fatty acids Hydrophobic tails Space-filling model (a) (b) Structural formula

  5. Fig. 5-15

  6. Lipids • Examples • Fats • Oils • Waxes • steroids • Functions • Energy storage • Protection • Chemical messenger

  7. Lipid Hydrophilic head WATER • Common Property • Nonpolar • Does not dissolve in water Hydrophobic tail WATER

  8. Fatty Acids • Saturated • All single Carbon to carbon bonds • Examples • Animal fat • Butter • Lard • Not very good for you • Unsaturated • One or more double carbon to carbon bonds • Examples • Plant oil – olive, corn, sunflower, etc… • Better for You

  9. Fig. 5-12 Structural formula of a saturated fat molecule Stearic acid, a saturated fatty acid (a) Saturated fat Structural formula of an unsaturated fat molecule Oleic acid, an unsaturated fatty acid cis double bond causes bending (b) Unsaturated fat

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