Food TestsGrade8
Test for starch
• Collect the food sample (liquid) in a test tube.
• Add few drops of iodine solution.(yellowish brown)
• If the colour changes from yellowish brown to blue black then thissubstance contains STARCH
Test for fat
• Collect the food sample (liquid) in a test tube.
• Add ethanol and shake well.
• Add water.
• If a cloudy mixture appears then the food sample contains FAT.
Test for protein
• Collect the food sample (liquid) in a test tube.
• Add 5 drops of copper sulphate.
• Add 5 drops of sodium hydroxide.
• If the colour changes from blue to purple then the food sample contains PROTIEN.
Test for sugar (glucose)
• Collect the food sample (liquid) in a test tube.
• Add few drops of Benedict’s solution.
• Place the test tube in a boiling water bath.
• If the colour changes from blue to green to orange to a red deposit, then the sample contains SUGAR (GLUCOSE)
• The colour change depends on the concentration of sugar in the sample.
Turns cloudy white
Emulsion testFats
Turns purpleBiuret testProteins
Turns redBenedicts solution
Sugars
Turns blue-blackIodineStarch
ResultTestSubstance tested
Food tests
These are some of the most common food tests:
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