Lipids

 

  • The category of molecules under the title of lipids, inlcude a diverse range of molecules that differ greatly in chemical composition but have one common characteristic i.e. they are insoluble in water.
  • This lack of solubility is due to the fact that lipids consist of hydrocarbon chains and rings which are non-polar.
    • Free Fatty Acids (FFA) consist of a non-polar hydrocarbon chain and a carboxyl (COOH) group.
    • If all the carbon atoms within the hydrocarbon chain are joined together by a single co-valent bond, than the FFA is said to be fully saturated, e.g. Palmitic Acid, C15H31COOH.
    • If on the other hand, one or more pairs of carbon atoms in the hydrocarbon chain are joined by double co-valent bonds, than the FFA is said to be unsaturated.