Biology food tests
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How to prepare food solution?
Crush food using pestle and mortar Add a few drops of water and mix well
What is the special type of water that contains no other chemical substances(pure water)?
Distilled water
How to test for starch (Iodine solution which is orange-yellow)?
Add a few drops of iodine solution to the food solution If the solution turns dark blue-black colour, the food contains starch
How to test for solid lipids (piece of filter paper)?
Rub some food onto a piece of filter paper Hold the paper up to a light and if the paper is translucent, the food contains lipids
How to test lipids for liquid lipids(ethanol that is colourless)?
Add a few drops of ethanol to your food solutions Shake the test tube and leave for a minute Pour ethanol into a test tube and leave for a minute Pour ethanol into a test tube of water If the solution turns cloudy, the food contains lipids
How to test for sugars (Benedict’s solution which is blue)?
Add a few drops of Benedict’s solution to your food solution Heat the test tube in the wet bath If the solution turns orange-red, the food contains sugars
How to test for protein (copper Sulfate which is pale blue and sodium hydroxide which is a colourless Liquid)?
Add a few drops of copper update into the food solution Add a few drops of sodium hydroxide solution If the solution turns purple, the food contains protein