How would you test for the presence of fat?

Answer 1

Get a brown paper bag and rub the food onto it. If the food has fats in it then the paper bag where you have rubbed the food onto it will turn translucent (lets light pass through but not see through) We did this experiment at St Michael's Grammar school in Victoria. I am in year 8.

Answer 2

For liquids Add 2cm (cube) of ethanol to a few drops of the unknown substance in a test tube Shake well Add 2 cm (cube) of water to the test tube. A Positive result will result in a cloudy white suspension forming at the top of the solution.For solids: Cut sample into a few pieces and place them in a test tube Add 2 cm (cube) of ethanol and shake it thoroughly. Allow solid to settle and decant ethanol into another test tube Add 2 cm(cube) of water to the new test tube A Positive result will result in a cloudy white suspension forming at the top of the solution.

Answer 3

How to test for fats:

1. Add 2 drops of fat (or the substance you want to test for fat) to a test tube

2. Add about 5cm3 ethanol to the test tube

3. Shake the test tube containing the above substances

4. Pour the solution out of the test tube and into another one containing a little water

5. A cloudy white emulsion will form if fat is present

Answer 4

The two traditional methods are solvent extraction (generally with something like a Soxhlet) followed by evaporating the solvent and weighing the residue, or by hydrolysis followed by extraction followed by gas chromatography. The GC method is more accurate.

Answer 5

mix the food with ethanol and then filter it, add the clear solution to water. a white emulsion means food has fat in it.

Answer 6

chemical test for fat presence