The emulsion test for lipids
The emulsion test detects lipids in a sample. You dissolve the sample in ethanol, then add water — a cloudy white emulsion forms if lipids are present.
Real World
Food scientists at Unilever use variants of the emulsion test during quality control to verify fat content in products like Flora margarine before it reaches supermarket shelves.
Exam Focus
State the positive result as a 'milky white emulsion' — 'cloudy' alone may not score; learn the exact mark-scheme wording.
Evaluation Scaffold
A four-step framework for high-quality evaluation. Use this for 'assess', 'evaluate', and 'to what extent' questions.
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