food tests gcse combined higher biology

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Last updated 1:15 PM on 5/6/26
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9 Terms

1
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Which test is used to detect the presence of reducing sugars (i.e. small sugars like glucose)?

benedict’s test

2
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what does iodine test for?

Starch

3
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what colour does the iodine solution go if starch is present

Orange to blue-black

4
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to test for protein what solution can we use

to test for protein we use biuret solution

5
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Biuret reagent can be used to test for the presence of proteins. If protein is present, what colour change takes place?

Blue to lilac / purple

6
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Which reagent is used to test for the presence of lipids?

Sudan III stain

7
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Sudan III test for lipids 

  1. Place 5cm3 of your food sample in a test tube.

  2. Add 3 drops of Sudan III stain solution.  

  3. Gently shake.

  4. If a red layer separates out on top, then lipid was present.

8
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sugar test

use benedict’s solution

9
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what colour change is it for sugar test

A positive result is a colour change from blue to green, yellow, orange, or brick-red