Food Tests for Proteins and Lipids Flashcards

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What is the name of the test used to detect protein in food?

The Biuret test is used to detect protein in a food sample.

What solution is added in the Biuret test for protein?

Biuret solution, which contains sodium hydroxide and copper sulfate, is added.

What colour change shows a positive result for protein in the Biuret test?

The solution changes from blue to purple or lilac if protein is present.

What result shows that no protein is present in the Biuret test?

The solution stays blue if there is no protein.

What is the name of the test used to detect lipids (fats and oils) in food?

The emulsion test is used to detect lipids in food.

Which two liquids are used in the emulsion test for lipids?

Ethanol is added to the food first, then water is added.

What positive result shows that lipids are present in the emulsion test?

A white, cloudy emulsion forms, making the liquid look milky.

What result shows that no lipids are present in the emulsion test?

The liquid stays clear, with no white, cloudy layer.

Why do we shake the food with ethanol in the emulsion test?

Shaking helps any lipids dissolve in the ethanol so they can form an emulsion.

Why must you keep ethanol away from naked flames during the emulsion test?

Ethanol is very flammable, so it can easily catch fire.