Macromolecule Lab Essay

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Macromolecule Lab Standard: Macromolecules are made from a small collection of simple precursors. Purpose o To understand the tests for macromolecules in foods. o To discover the types of nutrients contained in a variety of foods. Fill in the table. Macromolecule  Simple Precursor  Function Materials Supplies (To be taken to your table) (To remain at the supply table) *6 test tubes *Benedict’s Solution w/dropper *1 well plate *Lugol’s Solution w/dropper *Test tube holder *Biuret’s Solution w/dropper *Paper towels *Hot Water Bath *Test Tube clamps * Negative Test Indicators Procedure 1. Prepare 6 test tubes with food samples. a. Put a small amount of food at the bottom of the test tube b. Return to your station 2. Translucency tests lipids a. Place a dab of food sample on a piece of paper towel. b. Let each sample dry before checking for translucency. c. Record any observations. 3. Lugol’s solution tests starch a. Use a stir stick to put a small drop of EACH food from the test tube into a different well in the Well plate b. Add a drop of Lugol’s solution to each well. c. Record any color changes. 4. Biuret solution tests protein a. Use a stir stick to put a small drop of EACH food from the test tube into a different well in the Well plate b. Add a drop of Biuret solution to each well. c. Record any color changes. 5. Benedict’s solution tests sugar a. Add a dropperful of Benedict’s solution to each test tube. b. Place the test tube in a hot-water bath. c. Heat for 5 minutes. d. Record any color changes. e. Record whether the sample dried or remained see-through in the Observation section. Nutrient Foods Corn White beans White bread Potato chips Peanut butter Sugar Starch Protein Lipid Observations – record any color changes or translucency
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