2.7 Test Starch and Glucose

Describe the test for glucose and starch

GLUCOSE:

  • Get glucose powder and dissolve it in a test tube with water
  • Add Benedict Reagent (blue)
  • Take it and place it in a water bath ( temperate of water bath should be around 60 degrees centegrade)
  • After 2/3 minutes remove the test tube
  • The colour should change from blue to orange
    Screen_shot_2011-10-31_at_4

IF the solution of glucose is weak, the solution would be green

 

STARCH

  • Get starch powder and add some in a spotting tail
  • Add Iodine Solution (Pottasium Iodide)
  • Solution should change from brown to dark blue or black

Screen_shot_2011-10-31_at_4

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