Testing simple and complex sugars

Aim: To test a sample of food to determine whether it contains simple sugars
Method:
1. Place about 2 ml of the sample onto a test tube and then add 5 drops of benedict solution
2. Heat with a Bunsen until it changes colour. Do not boil.

Results:

Discussion: We dropped 5 drops of  Benedict solution to the food sample(apple). It was blue at first but after a few shakes it turned orange. The food sample turned orange because the Apple contains simple sugars.

Conclusion: The Apple contains simple sugars because it turned orange.
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Aim: To test if a sample food contains complex sugars.

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

Results: If complex sugars (i.e. starch) are present the iodine solution will change to brown colour to a blue/black colour


Discussion: We know that the food sample contains complex sugar because when we added iodine solution to the food sample it turned brown to black/blue.
Conclusion:the food sample contains complex sugar because it changed colours