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disturbances, endometriosis, plump wife , fatty acids definition , 6, hplc, atkins, miss plump , complete, female, macrobiotic, plump pussies , phytoestrogen, proteomics, prevention, excercise, lipids, glycerol and fatty acids , mental illness, | This observed in the series lauric (C12), palmitic (C16), stearic (C18). Room temperature is 25oC, Lauric acid which melts at 44o is still a solid, while balanced arachidonic acid has long since melted at -50o, so it is balanced a liquid at room temperature. Click for larger image Melting Points of Saturated vs. Unsaturated Fatty Acids: Note that as a group, the unsaturated fatty acids have lower melting points than the saturated fatty acids. The reason for this phenomenon can be found by a careful consideration of molecular geometries. The tetrahedral bond angles on carbon results in a molecular geometry balanced for saturated fatty acids that is relatively linear although with zigzags. See graphic on the left. This molecular structure allows many fatty acid molecules to be rather closely "stacked" together. As a result, close intermolecular interactions result in relatively high melting points. |
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However, in fatty acids, the non-polar hydrocarbon chain gives the molecule a non- polar character. Quiz: 6 Which acid (short chain or fatty) would most likely be soluble in water? Answer water is polar, in short 6 chain, acid group is polar, answer = short chain ... in hexane? Answer hexane is non-polar, in fatty acid, long 6 HC chain is non-polar answer = fatty acid Table of Fatty Acids on the left: The most common fatty acids are listed. Note that there are two groups of fatty acids--saturated and unsaturated. Recall that the term unsaturated refers to the presence of one or more double bonds between carbons as in alkenes. A saturated fatty acid has all bonding positions between carbons occupied by hydrogens. The melting points for the saturated fatty acids follow the boiling point principle observed previously. Melting point principle: as the molecular weight increases, the melting point increases. |
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