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Starch and Sugar Tests

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Starch Test
1. Chop up each food.
2. Add a little water to each food so that the nutrients are released from the food material.
3. Add three drops of iodine solution to each food suspension.
4. A change of colour of the iodine to blue-black indicates the presence of starch.



A test for reducing sugar
1. Chop up each food.
2. Add a little water to each food so that the nutrients are released from the food material.
3. Add Benedict’s reagent to each food suspension to a depth of 2 cm.
4. Shake the test tube gently.
5. Place it in a water bath of boiling water for 3 minutes and record the colour change.

Colour change:
• A sample that does not contain a reducing sugar will remain blue.
• A sample that contains reducing sugar will turn green, yellow, red or brown, depending on the increasing amount of reducing sugar.

This video shows how to test food for the presence of reducing sugars. This would indicate that sugar is present in food.
1. Bread
2. Nut
3. Grape juice

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