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Biology
Paper 1
food tests
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Leah
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Cards (9)
What is
benedicts
used to test for?
Sugars
Whta
is biuret used to test for?
proteins
What is iodine used to test for?
Starch
What is
Sudan 111
used to test for?
lipids (fats)
If sugar present it will turn...
Orange/red colour
If
protein
present it will turn...
Purple
If starch present it will turn...
Blue/black
If lipids present it will turn...
Milky white/cloudy
Steps of food test practical:
Get peice of food and break it up using water and pestle
Put crushed food into beaker with distilled water
Stir with glass rod until some peices of the food dissolve
Filter out the solution with a funnel and filter paper to get rid of the solid bits of the food
Solution that is left over will be put into a test tube and used for the food test
Add a few drops of biuret/benedict/iodine/suden 3
Heat test tube in a water bath for approx 10 mins at around 75 degrees