Biological Molecules: - Test For Lipids

- Test For Lipids - 

Test for lipids:

1. Take a completely dry and grease-free test tube.
2. Add 5cm³ of ethanol.
3. Shake the tube thoroughly to dissolve any lipid in the sample.
4. Add 5cm³ of water.
5. A cloudy - white colour indicates indicates the presence of a lipid.
6. Repeat using water instead of the sample, the final solution should remain clear.

The cloudy colour is due to any lipid in the sample being finely dispersed in the water to form an emulsion.