mehta46 - Biosynthesis of Fatty Acids Medical Biochemistry...

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Biosynthesis of Fatty Acids Medical Biochemistry Lecture #46
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FattyAcids       Fatty  acids  are  a  class  of  compounds  containing  a  long  hydrocarbon chain and a terminal carboxylate group. Nomenculature:    - Systematic name for a fatty acid is derived from the name  of its parent hydrocarbon by the substitution of oic for the  final e.           -  For  example,  the  C18  saturated  fatty  acid  is  called  octadecanoic acid (18:0) because the parent hydrocarbon is  octadecane.
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F.A. Nomenclature (cont.) -  C18  with  one  double  bond  is  called  octadecenoic  acid  (18:1);  with  two  double  bonds  is  called  octadecadienoic  acid  (18:2);  with  three  double  bonds, octadecatrienoic acid (18:3).
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Fatty acids vary in chain length  and degree of unsaturation:   • Usually contain an even number of carbon atoms,  typically  between  14  and  24.    The  16-  and  18- carbon fatty acids are most common.   • May  contain  one  or  more  double  bonds.    The  double  bonds  in  polyunsaturated  fatty  acids  are  separated by at least one methylene group.   • The  configuration  of  the  double  bonds  in  most  unsaturated fatty acids is cis. 
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dependent on their chain length and  on the degree of saturation. • -Melting  point  of  stearic  acid  is  69.6 o C,  whereas that of oleic acid (with one double  bond) is 13.4 o C.  
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mehta46 - Biosynthesis of Fatty Acids Medical Biochemistry...

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