LIPIDS

• Lipids - poorly soluble in water
• Lipids are classified into :

  1. fatty acids
  2. triglycerides
  3. sphingolipids
  4. steroids
• fatty acids - smallest unit of lipids
• fatty acids are divided into saturated and unstaturated
• saturated fatty acids

  • single-bonded fatty acids
  • solid at room temperature
• unsaturated fatty acids

  • double bonds
  • liquid at room temperature
• SAPONIFICATION

  • fatty acids react with NAOH producing soap
• The alkali metal salts of fatty acids usually containing 10 to 18 atoms are called soap
• The development of synthetic detergents or syndets solved problem of "scum" formation with soap.
• potassium hydrogen - odor
• soap molecule

  A) polar

  B) nonpolar