Macromolecule's Lab Reflection: Strawberry

In the Macromolecule Lab, each group used reagent tests to test a specific food to see which macromolecules existed in the substance. Ava and my food was strawberries. Before we began testing for macromolecules, we predicted that strawberries wouldn't have protein, starch, or lipids, but would have glucose. After testing our strawberry with reactant tests, we concluded that strawberries actually have proteins. Furthermore, our prediction that strawberries have glucose, and don't have starch and lipids, was correct.

To find out if strawberries had protein, starch, glucose, or lipids, we perfumed a series of tests. The first test we performed was to see if strawberries had proteins in them. By adding Biuret solution to our strawberry, we found that strawberries do have proteins because we saw brown in the solution. To find out if strawberries were made up of glucose, we added Benedict's solution to find that we had glucose, because we saw orange in solution, after heating up the test tube in boiling water. We found out we didn't have starch in our strawberry, after we added Lugol's iodine solution, and saw that there was no black in the strawberries solution. To find out if strawberries had lipids in them, we rubbed a part of the strawberry on a brown paper. After letting it dry overnight, we concluded that there aren't lipids in strawberries. We found this out, because we observed that after it had dried, there wasn't a silver glow where the strawberry had been rubbed on the paper.

We were able to determine if strawberries contained protein, starch, glucose, or lipids based on what color appears after adding each solution to the strawberry. Proteins produces a brown color; glucose produces an orange color; starch produces a black color; while lipids leave a silver glow.
If in solution, it didn't show that color while using the appropriate reagent test, then the substance doesn't have that macromolecule.

After researching our results on the internet we found that we found the right results, except in lipids. This site, showed us that strawberries do have protein and glucose. On another site, it says that lipids exist in strawberries. We might've misread our brown napkin. Since we thought we didn't see a silver glow, we presumed that there weren't lipids present in strawberries.