Food Test

• Starch test

  • Add iodine to the sample.
  • If iodine turns from brown to black, starch is present.
• Lipids test ( Emulsion test)

  • Add 10ml of distilled water and ethanol, and shake well.
  • If the top half of the solution goes from clear to milky(milky layer), lipids are present
• Glucose test

  • Add 10ml of Benedict's solution to the sample(until the sample is fully submerged)
  • Leave the mixture in a water bath for 5 minutes at 80C
  • Blue -> green / yellow = traces of reducing sugar
  • Blue -> orange = moderate
  • Blue -> brick red = large amount of reducing sugar
• Protein test

  • Add 1cm³ of each of Biuret reagent (solution A and B)
  • Mix them to make a blue color
  • Add the sample
  • If the solution turns from blue to purple / lilac, protein is present