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Food Tests - Coggle Diagram
Food Tests
Iodine test for starch
Method
- Add a few drops of iodine solution to the food sample using a pipette
- If starch is present, the solution turns from brown to blue-black
- Put some food sample into a test tube
Equipment
- 0,01 mol/dm3 Iodine Solution
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Test for protein
Method
- Shake the solution to mix and wait for a few minutes
- If protein is present, the solution turns from blue to purple
- Add a few drops of Biuret's reagent to the food sample in a test tube
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Test for lipids
Method
- Pour this mixture into a test tube of equal volumes of distilled water
- If lipids are present, a white emulsion is formed on the surface of the mixtures
- Add a few cm3 of of ethanol to the food sample.
- This is called the emulsion test
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