biological tests

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  • Biological tests
    • Iodine test
      • for startch
      • tested using iodine solution
      • turns blue/black in the presence of startch
    • benedicts
      • test to look for reudcing sugar
      • hear with benedicts reagent
      • if positive will turn from blue into a brick red precipitate
    • emulsion test
      • used to test for lipids
      • use 2cm^3 of ethanol
        • equal amount of water added
      • positive:milky white emulsion
    • non reducing sugars test
      • done reducing sugar test first with a negative result
      • add 2cm^3 of hydrochloric acid
      • neutralise with sodium hydroxide
      • add benedicts and heat
      • brick red precipitate formed


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