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Macromolecules Lab Report Essay

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The purpose of this lab was to use different indicators to determine what macromolecules are in different foods. We used Lugol’s solution to determine the starch content, Benedict’s solution to see the sugar content, Biuret reagent to test for the proteins, and used a paper bag to determine the lipid content.
Materials:

Vegetable Oil
Glucose
Starch from corn or potatoes
Powdered egg whites
Water
Lugol’s solution
Benedict’s solution
Biuret reagent
Pretzel
Toast
Jelly
Pineapple
Fat-free yogurt
Beans
Salami
Swiss cheese
Test Tubes
Test Tube Holder
Beaker
Hot plate

Analysis #1
1. Does dH2O contain any macromolecules? Why did we test dH2O with each of the indicators?
DH2O does not contain any macromolecules. We tested dH2O with each of the indicators because we needed a base to make sure the solutions were accurate in testing the controls.
2. …show more content…
Compare your testing results with the predictions you made in Table #1. Discuss any results that were not consistent with your prediction and explain why you think this occurred.
My predictions were the same as my testing results.
3. Did your test for glucose indicate there was glucose in the starch sample? Does that mean there is no glucose in starch?
The test indicated that there was no glucose in the starch sample. Starch itself is formed by many glucose polymers.
4. Suppose that for the container containing water you found a positive test for one of the organic compounds. How would you interpret this result?
I would assume that there was human error in the test or the water was contaminated.
Analysis #2
5. Which compound(s) is most commonly in food that comes from plants?

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