Science

Testing For Simple Sugars  - Benedict's test

Aim: To test a sample of food to determine weather it contains simple sugars.

Method:
Place about 2 ml of the sample into a test tube and then add 5 drops of Benedict's solution.
Heat with a Bunsen burner until it changes colour. Do not boil.

Results:
A positive test for a simple sugar results in the Benedict's solution changing from a blue colour to a orange colour.
No colour change is a negative result.

Discussion: The apple changed colour so it's a orange colour.

Conclusion:  We tested the sample of food to see if it would change colour and it did.

Testing For Complex Sugars - Iodine Test

Aim: To test if a sample of food contains complex sugars.

Method:
1. Place about 2 ml of the sample in a test tube.
2. Add 3 to 5 drops of iodine and mix.

Results:
If complex sugars are present the iodine solution will change from a brown colour to a blue/black colour. If iodine solution does not change colour then no complex sugars are present.

Discussion:  The bread didn't change colour it was just black.

Conclusion: The bread was brown at the start and didn't change colour.