1. The Science behind Proteins

2. Denaturation This means that a protein changes shape by;
Heating
Agitation (eg whisking)
Application of acid
This change might be permanent (eg when protein is heated…we’ll come to that in a bit. ) or temporary (when egg white is whisked into a foam then collapses.

3. Coagulation
When a protein is heated and changes from a liquid to a solid.

4. Foam Formation
When gas is trapped within egg by agitation - usually whisking.
Whisking makes the protein in the egg white unravel (denature). This allows tiny bubbles of air to be incorporated into the egg making the foam.
This denaturisation is reversible if the foam is left to stand it will collapse back into liquid egg white

5. PROVE IT !!! I’m going to give you and your partner an egg.
Denature the egg (change the proteins.)
Agitate the egg white to prove that you can change the shape of the proteins - producing a foam. Show me
Leave the egg white to return to foam proving that foam formation is reversible. Show me
Extension – Cook the egg yolk in the microwave for 10 seconds – proving that you can change the protein to a solid (coagulate) by heating. Show me