Testing for simple sugars and protein.

Testing for simple sugars - the Benedict's Test

Aim: Testing foods to see if they are simple, complex or Protein.

Method: 1. Place about 2 mL of the sample into a test tube and then add 5 drops of Benedict’s Solution.
2. Then heat with a water bath until it changes colour.

Equipment: Water bath, test tube tongs, Benedict's solution, a sample of food

Conclusion: Bread, apple and potato are all simple sugars.

Testing for protein - the Biuret Test

Aim: To test if a sample of food contains protein

Hypothesis: My hypothesis is that potato, milk and egg will be protein but bread sugar and apple wont.

Method:
1. Place about 2 mL of the sample into a test tube and add 5 drops of sodium hydroxide.
2. Add 5 drops of copper sulphate
3. Shake the test tube gently from side to side

Potato, apple, bread and sugar have no protein, but milk and egg do.

So in conclusion I am surprised that potato didn't have protein but the reason it doesn't it because its a carbohydrate. I think these experiments were very interesting and I learnt some new info.

Thank you for reading!