Food Tests
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What are the three steps for testing Fats
1.Grind up food sample using a pestle and mortar if solid 2. Add sample to test tube 3 .Add 2cm ethanol and shake well 4. Add 2cm of water into the test tube and shake well again
How do you know if fat is or is not present in a substance?
If fats are present, the solution becomes cloudy white If theres no fat, the solution remains clear
What are the 4 steps for testing for strach?
1.Crush the food sample 2.Put a small amount of the food on the simple tile 3.Add few drops (8-10) of distilled water 4. Add 3-4 drops of iodine
How do you know if starch is present in a substsance or not?
-if the solution turns blue-black, the food sample contains starch -if the solution turns yellowish-brown, there is an absence of starch
How to test for glucose?
1.Add equal volumes of the food sample solution and benedict solution to a test tube 2.Place the mixture in a water bath above 80 degrees for 5 mins
How do you know if glucose is in a substance or not?
If the mixture changes its colour from blue—>green —>yellow—->brick red—> brown, it means glucose is present If the mixture remains blue from the benedict solution, glucose is absent
How do you test for protiens?
• Add equal volumes of the food sample solution mixed with biuret reagent
How do you know if protiens is in a substance or not
-if a purple color shows, protien is present -if the mixture remains blue, its a negative test