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Food Tests Chemical Tests for Glucose, Starch, Proteins and Fats.

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Presentation on theme: "Food Tests Chemical Tests for Glucose, Starch, Proteins and Fats."— Presentation transcript:

1 Food Tests Chemical Tests for Glucose, Starch, Proteins and Fats.

2 Test for Glucose  Add 2 mL of blue Benedict’s solution to the solution being tested.  Heat gently in a waterbath.  Positive Test – solution turns green, orange or red colour.

3 Test for Glucose No Glucose Positive Test for Glucose

4 Test for Starch  Add a few drops of iodine solution to the solution being tested.  Positive Test – solution turns blue / black colour.

5 Test for Starch

6 Test for Protein  Add about 1 mL of blue copper sulfate solution and  Add about 1 mL of sodium hydroxide solution to the solution being tested. Now shake the mixture.  Positive Test – the solution turns purple if protein is present.

7 Test for Protein

8 Test for Fats  Put a spot of water on to a piece of filter paper. Label water.  Put a spot of fat or oil on to a piece of filter paper. Label fat or oil.  Leave to dry.

9 Test for Fats Fat / Oil Water Positive Test: The Fat or Oil spot will remain clear (translucent) while the water mark will disappear.

10 Test for Fats Fat / Oil Water Positive Test: The Fat or Oil spot will remain clear (translucent) while the water mark will disappear.


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