Biochemical Tests for Carbohydrates

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Test for Reducing Sugar:

  • Fill three test tubes; one with water, one with glucose and the other with sucrose
  • Add bendict solution to all three test tubes 
  • Gently swill until solution turn blue
  • Use tongs to add each solution to a water bath of 80*c
  • Use tongs to remove after three minutes
  • Glucose should have a colour change from blue to brick red, this shows a positive reaction

Test for Starch:

  • Pipette water and iodine solution into a test tube 
  • Pipette starch and iodine

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