Science Lab

3 Pages 706 Words

Title: What’s in the food you eat?

Introduction: The source of energy required for living is supplied by the food you eat. The nutrients in food supply both the matter and the energy that your body requires for human performance.

Purpose: The purpose of this lab was to determine the absence or presence of four specific nutrients, namely sugars, starches, proteins, and fats in some different foods.

Hypothesis: The four foods I choose for this experiment was a croissant, fruity pebbles, and applesauce. I believe that the croissant contains sugar, protein, and fats but I don’t believe the croissant-contained starch. The fruity pebbles, in my opinion, contain sugar, starch, and fats but not protein. Also, I believe the applesauce will consist of sugar, starch, and fats, but no protein.

Materials:
1) Test tubes
2) Test tube rack
3) Brown paper
4) Lugol’s Iodine
5) Benedict’s solution
6) Biuret’s solution
7) Croissant
8) Fruity pebbles
9) Apple sauce
10) Plastic petri dishes
11) Tool for mincing food
12) Beaker of water

Procedures:
1) I used iodine to indicate whether starch is present or if it is not present in the food.
2) I also used brown paper to see whether fat is present in the food.
3) Biuret’s solution indicated whether protein was present or not. If the color was purple protein was present.
4) Benedict’s solution indicated whether sugar was present or not. If the color turns orange, than sugar is present if not than sugar is not there.

Data:

Nutrients in Some Foods:

Foods Sugar Starch Protein Fats

Positive control + + + +

Negative control - - - -

#1 Croissant + + - + + - + +

#2 Fruity Pebb. + + + + - - + -

#3 Applesauce + + + - - - + +


Observations: As part of this lab I observed that when testing for starch if the color turns black than starch is present and if it just remains the same color then it does not...