Food Tests

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  • Food Tests
    • Carbohydrates
      • Starch
        • Add Iodine (KI)
          • Positive result: Solution turns from yellow/brown to blue/black.
      • Reducing Sugars
        • Benedict's Test
        • Add Benedict's solution and heat to 80oC.
          • Positive result: Turn from blue to a red/orange ppt.
            • Benedict's test doesn't work as no colour change. Boil with HCl, cool and neutralise with NaHCO3. Do Benedict's test again.
              • Non-reducing Sugars
                • Carbohydrates
                  • Starch
                    • Add Iodine (KI)
                      • Positive result: Solution turns from yellow/brown to blue/black.
                  • Reducing Sugars
                    • Benedict's Test
                    • Add Benedict's solution and heat to 80oC.
                      • Positive result: Turn from blue to a red/orange ppt.
                        • Benedict's test doesn't work as no colour change. Boil with HCl, cool and neutralise with NaHCO3. Do Benedict's test again.
                          • Non-reducing Sugars
      • Proteins
        • Add Biuret's reagent to sample.
          • NaOH and CuSO4  in Biuret's react with peptide bonds resulting in colour change.
          • Positive result: colour change from pale blue to lilac

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