Testing for nutrients

Testing Foods

Aim; What nutrients are are present in different foods.

Hypothesis;

We are testing for 

Simple sugar- which is carbohydrates that gives you sugar/energy fast.

Complex sugars- Slow releasing energy/sugar.

Protein- Long lasting Energy and sugar.

We are testing; 

Bread - I think this will be protein.,

Egg - I think this will be protein.

Glucose- I think this will be a complex sugar.

Apple - I think this will be simple sugar.

Milk - I think this will be Protein.

Potato - I think this will be complex sugar.

(Complex Test)

Equipment; Test tube, food sample, iodine solution.

Method;

1. Place about 2 ml of the sample in a test tube.

2. Add 3-5 drops of iodine and mix.

Result-

     +

Observations
Potato- positive
Apple- Positive
Bread- Positive
egg- negative
milk-negative
glucose-negative

Discussion-

Conclusion- The bread and potato was correct but i was wrong with the apple.

Testing for simple sugars. 

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

Equipment: Test Tubes, Benedicts solution, a sample of food.

Method:
Step 1- Place about 2 ml of the sample into a test tube and then add 5 drops of benedicts solution.
Step2-Put in a water bath until it changes colour. Do not boil.

Results-
Apple- Positive
potato-positive
Bread-Positive
Milk-Negative
Sugar-Positive
Egg-Positive

Testing for protein.

Aim: To test if a sample of food contains protein.

Hypo:Only the egg will turn purple.

Equipment: Test tube, Sodium hydroxide (haOH), Copper sulfate (coSO), Food sample.

Method:
Step 1- Place about 2 ml of the sample into a test tube and add 5 drops of sodium hydroxide.
Step 2- Add 5 drops of copper sulfate.
Step 3-Shake the test tube gently side to side.

Results:
Apple-Negative
Potato-Negative
Bread-Negative
Milk-Positive
Egg-Positive
Sugar-Negative

Conclusion: I was right about all but the potato.

Discussion: They turned purple because they come from animals and all meat has protein in it.