BCH Exm 3, 7

BCH Exm 3, 7 - Lipids and Biological Membranes 1 What are...

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Lipids and Biological Membranes 1
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2 Lipids are compounds that are insoluble in water and soluble in organic solvents. Lipid structure consists primarily of nonpolar groups. What are lipids?
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3 Lipids are classified into 2 groups: Linear compounds with a polar head and nonpolar tail Fatty acids Triacylglycerols Phosphoacylglycerols Glycolipids Spingolipids Fused ring structures or Steroids Cholesterol Testosterone Estradiol Progesterone
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What is a Fatty Acid? A fatty acid has a carboxyl group on one end And a hydrocarbon chain at the other end. Fatty acids are “ampipathic” compounds. Compounds that have a hydrophilic head [COOH] and hydrophobic tail [hydrocarbons]. Most fatty acids in living systems contain an even number of carbon atoms. Saturated fatty acids have C-C single bonds. Unsaturated fatty acids have one or more C=C double bonds usually in the cis configuration. .
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Some important fatty acids.
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6
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7 What is a Triacylglycerol? Glycerol is a simple compound with 3 hydroxyl groups. Each hydroxyl can form an ester linkage by the addition of an acyl or carbonyl group from a fatty acid. These 3 ester linkages result in a Triacyl glycerol. + 3 Triacylglycerols are also “ampipathic” compounds.
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8 Triacylglycerols usually have 3 different fatty acids attached as a mixed triacylglycerol.
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This note was uploaded on 04/30/2008 for the course BIO 311 taught by Professor Martin,howlett during the Spring '08 term at Rhode Island.

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BCH Exm 3, 7 - Lipids and Biological Membranes 1 What are...

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