Starch

• Starch is insoluble in water,

  No osmotic effect
• Describe the 2 polysaccharides of starch

  1.Amylose -

  • Monomer: alpha glucose
  • Bonds: 1,4 glycosidic bonds
  • Chains: Straight chain
  • Shape: Coiled structure
  • Property: Compact, so good for storage, can fit more in a small space.

  2.Amylopectin -

  • Monomers: alpha glucose
  • Bonds: 1,4 and 1,6 glycosidic bonds
  • Chains: branched chains
  • Shape: Coiled with branches
  • Property: rapid hydrolysis for energy, glucose can be released quickly.
• What is the purpose of starch?

  • Energy storage
  • Excess glucose as starch (broken down when needed)
• Whats a property of starch

  • Starch is insoluble in water
  • No osmotic effect
• How do you test for starch in leaves?

  • Boil in ethanol
  • Wash in water
  • Add iodine, if starch is present, it will turn dark blue/black