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ch369_sp11_lipids_notes - Todays topic Lipids...

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Lipid . Definition = A substance that is relatively insoluble in water, and can be extracted from a cell with a non-polar solvent. Some lipids: Fatty acids . Triacylglycerols . Phospholipids . Cholesterol . Vitamins A,D,E,K . Sphingolipids. Today’s topic - Lipids & membranes (Chapter 8) .
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Fatty acids (FAs). Fatty acid Carboxylic acids with chains of varying lengths. 12 to 24 carbons are common, usually even numbers. pKa is about 4, so negative charge at physiological pH. Fatty acid
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Some common saturated fatty acids. ( saturated means no double bonds in carbon chain). stearate Laurate, 12 carbons. Myristate, 14 carbons. Palmitate, 16 carbons. Stearate, 18 carbons. Arachinate, 20 carbons.
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Some common unsaturated fatty acids. Linoleate (or linoleic acid), a polyunsaturated fatty acid. Oleate (or oleic acid), an unsaturated fatty acid. Notice the numbering system (carboxylate carbon is #1)
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Unsaturated fatty acids can be either cis or trans isomer around double bond. Most naturally occurring fatty acids are cis . Cis have lower melting point than trans (trans FA’s pack together better, tend to form solids).
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Triacylglycerols (TAGs). Fatty acid (TAG) (FA)
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Tristearin (a simple triacylglycerol).
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Triacylglycerols can have mixed acyl chains.
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solidifies easily. acyl chains are more liquid.
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FAs and TAGs store a lot of energy in a small volume .
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