Biology: Food Tests

Description

How to find out what foods are present in samples and the results.
Chloe Bennett
Mind Map by Chloe Bennett, updated more than 1 year ago
Chloe Bennett
Created by Chloe Bennett almost 10 years ago
268
0

Resource summary

Biology: Food Tests
  1. Lipid
    1. Mix with ethanol. Pour mixture into water.
      1. If present: cloudy, white emulsion will form at top of water.
      2. Reducing Sugars
        1. Heat sample with Benedict's solution (alkaline copper sulfate).
          1. If present: colour change from blue to orange-red.
          2. Non-Reducing Sugars
            1. Make sure there are no reducing sugars in sample first.
              1. Boil in hydrochloric acid (HCl). Cool it and neutralise it by adding sodium carbonate or sodium hydrogrencarbonate.
                1. Carry out reducing sugar test again.
                  1. If present: will give a positive result in reducing sugar test.
                  2. Starch
                    1. Add a solution of iodine
                      1. If present: changes colour from yellow-brown to blue-black.
                      2. Protein
                        1. Add biuret reagent of sodium hydroxide and copper sulfate.
                          1. If present: colour change from light blue to lilac.
                          Show full summary Hide full summary

                          Similar

                          Lipids
                          Eleanor H
                          Biology- Genes, Chromosomes and DNA
                          Laura Perry
                          Biology- Genes and Variation
                          Laura Perry
                          Enzymes and Respiration
                          I Turner
                          AQA Biology 8.1 structure of DNA
                          Charlotte Hewson
                          Biology Unit 2 - DNA, meiosis, mitosis, cell cycle
                          DauntlessAlpha
                          Cells And Cell Techniques - Flashcards (AQA AS-Level Biology)
                          Henry Kitchen
                          Cell Structure
                          megan.radcliffe16
                          GCSE Biology - Homeostasis and Classification Flashcards
                          Beth Coiley
                          Exchange surfaces and breathing
                          megan.radcliffe16
                          AQA Biology 12.1 cellular organisation
                          Charlotte Hewson