mcb450-8f09

mcb450-8f09 - Chapter 8 Lipids Office Hours Today...

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Unformatted text preview: Chapter 8 Lipids Office Hours Today (9/15/09): 1:45-3:00, Noyes 208 Work on Problem Set 1, and start reviewing old examinations. Fatty Acids Fatty acids are carboxylic acids with long hydrocarbon chains. Major building blocks of neutral fats and phsopholipids. Two major classes saturated unsaturated (contain one or more double bonds, usually cis .) Unsaturated Fatty Acids Naturally-occurring unsaturated fatty acids usually have a cis double bond between C 9 and C 10 , introducing a bend into the hydrocarbon tail. When more than one double bond exists in a polyunsaturated fatty acid, the double bonds are never conjugated. Rather there is an insulating methylene group. Table 8-1, p. 220 Fatty Acids No. C Atoms Name Melting Temp (C) 16 Palmitic acid (16:0)* 63.1 18 Stearic acid (18:0) 69.6 20 Arachidic acid (20:0) 76.5 16 Palmitoleic Acid (16:1)-0.5 18 Oleic acid (18:1) 13.4 * The first number in parentheses give the number of carbon atoms. The second gives the number of cis double bonds. Fig. 8-1b, p. 221 (16:0) (18:0) Common Saturated Fatty Acids Fig. 8-1c, p. 221 (18:1) (18:2) Common Unsaturated Fatty Acids Note that the two double-bonds are not conjugated. Table 8-2, p. 221 (C12 and C14) trans Fatty Acids Are similar to saturated fatty acids in their physical properties, because they lack a kink in their tails. Are produced by partial hydrogenation of vegetable and fish oils. Raise plasma LDL cholesterol and triacylglycerol levels (bad) and lower plasma HDL cholesterol levels (also bad). Margarine has a high content of trans fatty acids. trans Fatty Acids Are similar to saturated fatty acids in their physical properties, because they lack a kink in their tails....
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mcb450-8f09 - Chapter 8 Lipids Office Hours Today...

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