BB lecture 9-12-08 lipids

BB lecture 9-12-08 lipids - Chapter 5 (pp.74-77): Large...

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Learning objectives - For Lipids… Know the elements of typical lipids Describe the building-block molecules, structure, and biological importance of fats , phospholipids , waxes and steroids Identify an ester linkage and describe how it is formed Distinguish between saturated and unsaturated fats Compare the energy content of carbohydrates and lipids Additional terms to know include…omega fatty acid, hydrogenation, trans/cis fatty acid, LDL/HDL, mono-/di-/tri-glyceride, hydrophilic, hydrophobic. . Chapter 5 (pp.74-77): Large Biological Molecules (continued)
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Lipids… composed of C, H, O, & one type also has P DO NOT consist of polymers are diverse, but share the common trait of being hydrophobic
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Lipids called “fats” are made up of: 3 fatty acids + glycerol Fatty acids are long chain hydrocarbons + a carboxyl group at one end
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SATURATED F atty acids : Those with the maximum number of hydrogen atoms covalently bonded to its carbon atoms, no more can be added . Such fatty acids can “pack” close together, and are solid at room temperature (examples – animal fat, lard, real butter…) UNSATURATED Fatty acids have less hydrogen atoms because of one or more double bonds between carbon atoms, Because of the kinks in the hydrocarbon tails, unsaturated fats can’t pack as closely together, thus, they “flow” as oils at room temperature (e.g. plant oils like vegetable oil, corn oil, olive oil…).
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In HYDROGENATION , unsaturated oils are exposed to hydrogen at a high temperature and in the presence of a catalyst. Two things result:
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BB lecture 9-12-08 lipids - Chapter 5 (pp.74-77): Large...

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