Biology 1.3 Nutrients and food test

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Nutrition and Food Tests unit 1.4
Patricia Rogers
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Patricia Rogers
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Biology 1.3 Nutrients and food test
  1. Food Tests
    1. iodine: Tests for starch Yellow-brown > blue black
      1. 3. Check to see if there's a negaive or positive colour change
      2. Ethanol: Tests for fat Colourless> white emulsion
        1. 2. Add a few drops of the solution to the test tube
        2. Biuret: Tests for protein Blue> Purple
          1. 1. Add 1cm3 of the substance to a test tube, using a syringe
          2. Benadict's: Tests for glucose Blue> Brick Red
            1. If testing using benadict's, put the test tube in a water bath for a few minutes after step 2.
          3. Biological molecules
            1. Protein
              1. Used for growth, repair, collegine, enzymes and hormones
                1. Made up of amino acids
                2. Fats/ Lipids
                  1. Made up of 3 fatty acids and glycerol
                    1. Used for insulation of heat, protection of organs and store of enery
                    2. Carbohydrates
                      1. Simple Carbohydrates
                        1. Glucose, Sugar and Lactose are a source of energy
                        2. Complex Carbohydrates
                          1. Cellulose is used as a cell wall in plants
                            1. Starch is used as an energy store in plants
                              1. Glycogen is used as an energy store in animals

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