The process
1. Add the food sample to ethanol
2. Shake the tube thoroughly to dissolve any lipid in the sample
3. Add water and shake gently
4. A cloudy-whte colour indicates the presence of a lipid
5. As a control, repeat the procedure using water instead of the sample- The final solution should remain clear
- The cloudy-white colour is due to any lipid in the sample being finely dispersed in the water to form an emulsion- Light passing through this emulsion is refracted as it passes from oil droplets to water droplets making it appear cloudy
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