Nutrient tests

Created by: nina.pearson
Created on: 24-11-20 08:50

Test for starch

1. Add a few drops of iodine solution to the food solution.
2. If the solution turns a dark blue-black color, the food contains starch.

1 of 5

Test for lipids (solid)

1. Rub some of the food onto a piece of filter paper.

2. Hold the paper up to the light. If the paper has gone translucent, the food contains lipids.

2 of 5

Test for lipids (in solution)

1. Add a few drops of ethanol.
2. Shake the tube and leave for 1 minute. – the oil will be at the bottom and ethanol on the top.
3. Pour the ethanol into a test tube of water.
4. If the solution turns cloudy, the food contains lipids.

3 of 5

Test for protein

1. Add a few drops of the Biuret reagent (copper sulfate and sodium hydroxide solution) to the food solution.

2. If the solution turns purple, the food contains protein.

4 of 5

Test for sugar

1. Add a few drops of Benedict’s solution to the food solution.

2. Heat the mixture in a water bath or with a bunsen burner.

3. Solution will change color if sugar is present.

5 of 5

Other cards in this set

Card 2

Front

Test for lipids (solid)

Back

1. Rub some of the food onto a piece of filter paper.

2. Hold the paper up to the light. If the paper has gone translucent, the food contains lipids.

Card 3

Front

Test for lipids (in solution)

Back

Card 4

Front

Test for protein

Back

Card 5

Front

Test for sugar

Back

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Nutrient tests