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1729497
Biology: Food Tests
Description
How to find out what foods are present in samples and the results.
No tags specified
biology
lipids
starch
reducingsugars
non-reducingsugars
protein
Mind Map by
Chloe Bennett
, updated more than 1 year ago
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Created by
Chloe Bennett
almost 10 years ago
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Resource summary
Biology: Food Tests
Lipid
Mix with ethanol. Pour mixture into water.
If present: cloudy, white emulsion will form at top of water.
Reducing Sugars
Heat sample with Benedict's solution (alkaline copper sulfate).
If present: colour change from blue to orange-red.
Non-Reducing Sugars
Make sure there are no reducing sugars in sample first.
Boil in hydrochloric acid (HCl). Cool it and neutralise it by adding sodium carbonate or sodium hydrogrencarbonate.
Carry out reducing sugar test again.
If present: will give a positive result in reducing sugar test.
Starch
Add a solution of iodine
If present: changes colour from yellow-brown to blue-black.
Protein
Add biuret reagent of sodium hydroxide and copper sulfate.
If present: colour change from light blue to lilac.
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